From 5db60dcac9d346c9d4cef37292f2fdb66ac35f1e Mon Sep 17 00:00:00 2001 From: Marijn Haverbeke Date: Tue, 2 Oct 2012 18:01:25 +0200 Subject: [PATCH] Conform to Moz spec with regards to `loc` properties --- acorn.js | 65 +- index.html | 225 +- test/driver.js | 25 +- test/tests.js | 21560 +++++++++++++++++++++++++++++++++++++++-------- 4 files changed, 18137 insertions(+), 3738 deletions(-) diff --git a/acorn.js b/acorn.js index c635f0777a..afd5b9fedb 100644 --- a/acorn.js +++ b/acorn.js @@ -22,10 +22,7 @@ // browser) is a `parse` function that takes a code string and // returns an abstract syntax tree as specified by [Mozilla parser // API][api], with the caveat that the SpiderMonkey-specific syntax - // (`let`, `yield`, inline XML, etc) is not recognized, and that - // range information is attached directly to the AST nodes as - // `start` and `end` properties, rather than wrapped in an - // additional object under a `loc` property. + // (`let`, `yield`, inline XML, etc) is not recognized. // // [api]: https://developer.mozilla.org/en-US/docs/SpiderMonkey/Parser_API @@ -64,15 +61,15 @@ // after and before it), but never twice in the before (or after) // array of different nodes. trackComments: false, - // By default, the `start` and `end` properties attached to nodes hold - // offsets into the file. When `linePositions` is on, they will hold - // `{offset, line, column}` (with line being 1-based and column - // 0-based) instead. - linePositions: false + // When `locations` is on, `loc` properties holding objects with + // `start` and `end` properties in `{line, column}` form (with + // line being 1-based and column 0-based) will be attached to the + // nodes. + locations: false }; // The `getLineInfo` function is mostly useful when the - // `linePositions` option is off (for performance reasons) and you + // `locations` option is off (for performance reasons) and you // want to find the line/column position for a given character // offset. `input` should be the code string that the offset refers // into. @@ -98,12 +95,15 @@ var tokPos; - // The start and end positions of the current token. These hold - // integers when `options.linePositions` is false, and objects - // otherwise. + // The start and end offsets of the current token. var tokStart, tokEnd; + // When `options.locations` is true, these hold objects + // containing the tokens start and end line/column pairs. + + var tokStartLoc, tokEndLoc; + // The type and value of the current token. Token types are objects, // named by variables against which they can be compared, and // holding properties that describe them (indicating, for example, @@ -128,16 +128,16 @@ var tokRegexpAllowed, tokComments; - // When `options.linePositions` is true, these are used to keep + // When `options.locations` is true, these are used to keep // track of the current line, and know when a new line has been - // entered. See the `curLinePos` function. + // entered. See the `curLineLoc` function. var tokCurLine, tokLineStart, tokLineStartNext; // These store the position of the previous token, which is useful // when finishing a node and assigning its `end` position. - var lastStart, lastEnd; + var lastStart, lastEnd, lastEndLoc; // This is the parser's state. `inFunction` is used to reject // `return` statements outside of functions, `labels` to verify that @@ -358,10 +358,9 @@ // ## Tokenizer - // These are used when `options.linePositions` is on, in order to - // track the current line number and start of line offset, so that - // `tokStart` and `tokEnd` refer to position objects indead of - // integer offsets. + // These are used when `options.locations` is on, in order to track + // the current line number and start of line offset, in order to set + // `tokStartLoc` and `tokEndLoc`. function nextLineStart() { lineBreak.lastIndex = tokLineStart; @@ -369,13 +368,13 @@ return match ? match.index + match[0].length : input.length + 1; } - function curLinePos() { + function curLineLoc() { while (tokLineStartNext <= tokPos) { ++tokCurLine; tokLineStart = tokLineStartNext; tokLineStartNext = nextLineStart(); } - return {offset: tokPos, line: tokCurLine, column: tokPos - tokLineStart}; + return {line: tokCurLine, column: tokPos - tokLineStart}; } // Reset the token state. Used at the start of a parse. @@ -395,7 +394,8 @@ // the right position. function finishToken(type, val) { - tokEnd = options.linePositions ? curLinePos() : tokPos; + tokEnd = tokPos; + if (options.locations) tokEndLoc = curLineLoc(); tokType = type; skipSpace(); tokVal = val; @@ -456,7 +456,8 @@ // `tokRegexpAllowed` trick does not work. See `parseStatement`. function readToken(forceRegexp) { - tokStart = options.linePositions ? curLinePos() : tokPos; + tokStart = tokPos; + if (options.locations) tokStartLoc = curLineLoc(); tokCommentsBefore = tokComments; if (forceRegexp) return readRegexp(); if (tokPos >= inputLen) return finishToken(_eof); @@ -782,6 +783,7 @@ function next() { lastStart = tokStart; lastEnd = tokEnd; + lastEndLoc = tokEndLoc; readToken(); } @@ -790,7 +792,7 @@ function setStrict(strct) { strict = strct; - tokPos = options.linePositions ? lastEnd.offset : lastEnd; + tokPos = lastEnd; skipSpace(); readToken(); } @@ -804,6 +806,8 @@ node.commentsBefore = tokCommentsBefore; tokCommentsBefore = null; } + if (options.locations) + node.loc = {start: tokStartLoc, end: null}; return node; } @@ -818,6 +822,9 @@ node.commentsBefore = other.commentsBefore; other.commentsBefore = null; } + if (options.locations) + node.loc = {start: other.loc.start, end: null}; + return node; } @@ -844,6 +851,8 @@ } lastFinishedNode = node; } + if (options.locations) + node.loc.end = lastEndLoc; return node; } @@ -869,8 +878,7 @@ function canInsertSemicolon() { return tokType === _eof || tokType === _braceR || !options.strictSemicolons && - newline.test(options.linePositions ? input.slice(lastEnd.offset, tokStart.offset) - : input.slice(lastEnd, tokStart)); + newline.test(input.slice(lastEnd, tokStart)); } // Consume a semicolon, or, failing that, see if we are allowed to @@ -911,7 +919,8 @@ function parseTopLevel() { initTokenState(); - lastStart = lastEnd = options.linePositions ? curLinePos() : tokPos; + lastStart = lastEnd = tokPos; + if (options.locations) lastEndLoc = curLineLoc(); inFunction = strict = null; labels = []; readToken(); diff --git a/index.html b/index.html index 442487c9dd..5af8df0c75 100644 --- a/index.html +++ b/index.html @@ -17,10 +17,7 @@ https://github.com/marijnh/acorn.git browser) is a parse function that takes a code string and returns an abstract syntax tree as specified by Mozilla parser API, with the caveat that the SpiderMonkey-specific syntax -(let, yield, inline XML, etc) is not recognized, and that -range information is attached directly to the AST nodes as -start and end properties, rather than wrapped in an -additional object under a loc property.

  var options, input, inputLen;
+(let, yield, inline XML, etc) is not recognized.
                                         
  var options, input, inputLen;
 
   exports.parse = function(inpt, opts) {
     input = String(inpt); inputLen = input.length;
@@ -40,12 +37,12 @@ trailing commas in array and object literals.
             
 holding arrays of strings. A single comment may appear in both
 a commentsBefore and commentsAfter array (of the nodes
 after and before it), but never twice in the before (or after)
-array of different nodes.
                                         
    trackComments: false,
                                                                                   
                                
               
By default, the start and end properties attached to nodes hold
-offsets into the file. When linePositions is on, they will hold
-{offset, line, column} (with line being 1-based and column
-0-based) instead.
                                         
    linePositions: false
+array of different nodes.
                                         
    trackComments: false,
                                                                                   
                                
               
When locations is on, loc properties holding objects with
+start and end properties in {line, column} form (with
+line being 1-based and column 0-based) will be attached to the
+nodes.
                                         
    locations: false
   };
                                                                                   
                                
               
The getLineInfo function is mostly useful when the
-linePositions option is off (for performance reasons) and you
+locations option is off (for performance reasons) and you
 want to find the line/column position for a given character
 offset. input should be the code string that the offset refers
 into.
                                         
  var getLineInfo = exports.getLineInfo = function(input, offset) {
@@ -61,27 +58,26 @@ into.
                                         
};
                                                                                   
                                
               
Acorn is organized as a tokenizer and a recursive-descent parser.
 Both use (closure-)global variables to keep their state and
 communicate. We already saw the options, input, and
-inputLen variables above (set in parse).
                                         
                                                                                   
                                
               
The current position of the tokenizer in the input.
                                         
  var tokPos;
                                                                                   
                                
               
The start and end positions of the current token. These hold
-integers when options.linePositions is false, and objects
-otherwise.
                                         
  var tokStart, tokEnd;
                                                                                   
                                
               
The type and value of the current token. Token types are objects,
+inputLen variables above (set in parse).
                                         
                                                                                   
                                
               
The current position of the tokenizer in the input.
                                         
  var tokPos;
                                                                                   
                                
               
The start and end offsets of the current token.
                                         
  var tokStart, tokEnd;
                                                                                   
                                
               
When options.locations is true, these hold objects
+containing the tokens start and end line/column pairs.
                                         
  var tokStartLoc, tokEndLoc;
                                                                                   
                                
               
The type and value of the current token. Token types are objects,
 named by variables against which they can be compared, and
 holding properties that describe them (indicating, for example,
 the precedence of an infix operator, and the original name of a
 keyword token). The kind of value that's held in tokVal depends
 on the type of the token. For literals, it is the literal value,
-for operators, the operator name, and so on.
                                         
  var tokType, tokVal;
                                                                                   
                                
               
These are used to hold arrays of comments when
-options.trackComments is true.
                                         
  var tokCommentsBefore, tokCommentsAfter;
                                                                                   
                                
               
Interal state for the tokenizer. To distinguish between division
+for operators, the operator name, and so on.
                                         
  var tokType, tokVal;
                                                                                   
                                
               
These are used to hold arrays of comments when
+options.trackComments is true.
                                         
  var tokCommentsBefore, tokCommentsAfter;
                                                                                   
                                
               
Interal state for the tokenizer. To distinguish between division
 operators and regular expressions, it remembers whether the last
 token was one that is allowed to be followed by an expression.
 (If it is, a slash is probably a regexp, if it isn't it's a
 division operator. See the parseStatement function for a
-caveat.)
                                         
  var tokRegexpAllowed, tokComments;
                                                                                   
                                
               
When options.linePositions is true, these are used to keep
+caveat.)
                                         
  var tokRegexpAllowed, tokComments;
                                                                                   
                                
               
When options.locations is true, these are used to keep
 track of the current line, and know when a new line has been
-entered. See the curLinePos function.
                                         
  var tokCurLine, tokLineStart, tokLineStartNext;
                                                                                   
                                
               
These store the position of the previous token, which is useful
-when finishing a node and assigning its end position.
                                         
  var lastStart, lastEnd;
                                                                                   
                                
               
This is the parser's state. inFunction is used to reject
+entered. See the curLineLoc function.
                                         
  var tokCurLine, tokLineStart, tokLineStartNext;
                                                                                   
                                
               
These store the position of the previous token, which is useful
+when finishing a node and assigning its end position.
                                         
  var lastStart, lastEnd, lastEndLoc;
                                                                                   
                                
               
This is the parser's state. inFunction is used to reject
 return statements outside of functions, labels to verify that
 break and continue have somewhere to jump to, and strict
-indicates whether strict mode is on.
                                         
  var inFunction, labels, strict;
                                                                                   
                                
               
This function is used to raise exceptions on parse errors. It
+indicates whether strict mode is on.
                                         
  var inFunction, labels, strict;
                                                                                   
                                
               
This function is used to raise exceptions on parse errors. It
 takes either a {line, column} object or an offset integer (into
 the current input) as pos argument. It attaches the position
 to the end of the error message, and then raises a SyntaxError
@@ -89,12 +85,12 @@ with that message.
                          
     if (typeof pos == "number") pos = getLineInfo(input, pos);
     message += " (" + pos.line + ":" + pos.column + ")";
     throw new SyntaxError(message);
-  }
                                                                                   
                                
               
Token types
                                         
                                                                                   
                                
               
The assignment of fine-grained, information-carrying type objects
+  }
                                                                                   
                                
               
Token types
                                         
                                                                                   
                                
               
The assignment of fine-grained, information-carrying type objects
 allows the tokenizer to store the information it has about a
-token in a way that is very cheap for the parser to look up.
                                         
                                                                                   
                                
               
All token type variables start with an underscore, to make them
-easy to recognize.
                                         
                                                                                   
                                
               
These are the general types. The type property is only used to
+token in a way that is very cheap for the parser to look up.
                                         
                                                                                   
                                
               
All token type variables start with an underscore, to make them
+easy to recognize.
                                         
                                                                                   
                                
               
These are the general types. The type property is only used to
 make them recognizeable when debugging.
                                         
  var _num = {type: "num"}, _regexp = {type: "regexp"}, _string = {type: "string"};
-  var _name = {type: "name"}, _eof = {type: "eof"};
                                                                                   
                                
               
Keyword tokens. The keyword property (also used in keyword-like
+  var _name = {type: "name"}, _eof = {type: "eof"};
                                                                                   
                                
               
Keyword tokens. The keyword property (also used in keyword-like
 operators) indicates that the token originated from an
 identifier-like word, which is used when parsing property names.

 
@@ -111,10 +107,10 @@ continue jumps to that label.
                          var _finally = {keyword: "finally"}, _for = {keyword: "for", isLoop: true}, _function = {keyword: "function"};
   var _if = {keyword: "if"}, _return = {keyword: "return", beforeExpr: true}, _switch = {keyword: "switch"};
   var _throw = {keyword: "throw", beforeExpr: true}, _try = {keyword: "try"}, _var = {keyword: "var"};
-  var _while = {keyword: "while", isLoop: true}, _with = {keyword: "with"}, _new = {keyword: "new", beforeExpr: true};                                                                                   
                                
               
The keywords that denote values.
                                         
  var _null = {keyword: "null", atomValue: null}, _true = {keyword: "true", atomValue: true};
-  var _false = {keyword: "false", atomValue: false};
                                                                                   
                                
               
Some keywords are treated as regular operators. in sometimes
+  var _while = {keyword: "while", isLoop: true}, _with = {keyword: "with"}, _new = {keyword: "new", beforeExpr: true};                                                                                   
                                
               
The keywords that denote values.
                                         
  var _null = {keyword: "null", atomValue: null}, _true = {keyword: "true", atomValue: true};
+  var _false = {keyword: "false", atomValue: false};
                                                                                   
                                
               
Some keywords are treated as regular operators. in sometimes
 (when parsing for) needs to be tested against specifically, so
-we assign a variable name to it for quick comparing.
                                         
  var _in = {keyword: "in", binop: 7, beforeExpr: true};
                                                                                   
                                
               
Map keyword names to token types.
                                         
  var keywordTypes = {"break": _break, "case": _case, "catch": _catch,
+we assign a variable name to it for quick comparing.
                                         
  var _in = {keyword: "in", binop: 7, beforeExpr: true};
                                                                                   
                                
               
Map keyword names to token types.
                                         
  var keywordTypes = {"break": _break, "case": _case, "catch": _catch,
                       "continue": _continue, "debugger": _debugger, "default": _default,
                       "do": _do, "else": _else, "finally": _finally, "for": _for,
                       "function": _function, "if": _if, "return": _return, "switch": _switch,
@@ -123,10 +119,10 @@ we assign a variable name to it for quick comparing.
             
                       "instanceof": {keyword: "instanceof", binop: 7},
                       "typeof": {keyword: "typeof", prefix: true},
                       "void": {keyword: "void", prefix: true},
-                      "delete": {keyword: "delete", prefix: true}};
                                                                                   
                                
               
Punctuation token types. Again, the type property is purely for debugging.
                                         
  var _bracketL = {type: "[", beforeExpr: true}, _bracketR = {type: "]"}, _braceL = {type: "{", beforeExpr: true};
+                      "delete": {keyword: "delete", prefix: true}};
                                                                                   
                                
               
Punctuation token types. Again, the type property is purely for debugging.
                                         
  var _bracketL = {type: "[", beforeExpr: true}, _bracketR = {type: "]"}, _braceL = {type: "{", beforeExpr: true};
   var _braceR = {type: "}"}, _parenL = {type: "(", beforeExpr: true}, _parenR = {type: ")"};
   var _comma = {type: ",", beforeExpr: true}, _semi = {type: ";", beforeExpr: true};
-  var _colon = {type: ":", beforeExpr: true}, _dot = {type: "."}, _question = {type: "?", beforeExpr: true};
                                                                                   
                                
               
Operators. These carry several kinds of properties to help the
+  var _colon = {type: ":", beforeExpr: true}, _dot = {type: "."}, _question = {type: "?", beforeExpr: true};
                                                                                   
                                
               
Operators. These carry several kinds of properties to help the
 parser use them properly (the presence of these properties is
 what categorizes them as operators).

 
@@ -147,7 +143,7 @@ in AssignmentExpression nodes.
                          var _bin3 = {binop: 3, beforeExpr: true}, _bin4 = {binop: 4, beforeExpr: true};
   var _bin5 = {binop: 5, beforeExpr: true}, _bin6 = {binop: 6, beforeExpr: true};
   var _bin7 = {binop: 7, beforeExpr: true}, _bin8 = {binop: 8, beforeExpr: true};
-  var _bin10 = {binop: 10, beforeExpr: true};                                                                                   
                                
               
This is a trick taken from Esprima. It turns out that, on
+  var _bin10 = {binop: 10, beforeExpr: true};                                                                                   
                                
               
This is a trick taken from Esprima. It turns out that, on
 non-Chrome browsers, to check whether a string is in a set, a
 predicate containing a big ugly switch statement is faster than
 a regular expression, and on Chrome the two are about on par.
@@ -170,7 +166,7 @@ predicate from a space-separated string of words.

       f += "switch(str){";
       for (var i = 0; i < arr.length; ++i) f += "case " + JSON.stringify(arr[i]) + ":";
       f += "return true}return false;";
-    }                                                                                   
                                
               
When there are more than three length categories, an outer
+    }                                                                                   
                                
               
When there are more than three length categories, an outer
 switch first dispatches on the lengths, to save on comparisons.
                                         
    if (cats.length > 3) {
       cats.sort(function(a, b) {return b.length - a.length;});
       f += "switch(str.length){";
@@ -179,54 +175,54 @@ switch first dispatches on the lengths, to save on comparisons.

         f += "case " + cat[0].length + ":";
         compareTo(cat);
       }
-      f += "}";
                                                                                   
                                
               
Otherwise, simply generate a flat switch statement.
                                         
    } else {
+      f += "}";
                                                                                   
                                
               
Otherwise, simply generate a flat switch statement.
                                         
    } else {
       compareTo(words);
     }
     return (1, eval)(f + "})");
-  }
                                                                                   
                                
               
The ECMAScript 3 reserved word list.
                                         
  var isReservedWord3 = makePredicate("abstract boolean byte char class double enum export extends final float goto implements import int interface long native package private protected public short static super synchronized throws transient volatile");
                                                                                   
                                
               
ECMAScript 5 reserved words.
                                         
  var isReservedWord5 = makePredicate("class enum extends super const export import");
                                                                                   
                                
               
The additional reserved words in strict mode.
                                         
  var isStrictReservedWord = makePredicate("implements interface let package private protected public static yield");
                                                                                   
                                
               
The forbidden variable names in strict mode.
                                         
  var isStrictBadIdWord = makePredicate("eval arguments");
                                                                                   
                                
               
And the keywords.
                                         
  var isKeyword = makePredicate("break case catch continue debugger default do else finally for function if return switch throw try var while with null true false instanceof typeof void delete new in");
                                                                                   
                                
               
Character categories
                                         
                                                                                   
                                
               
Big ugly regular expressions that match characters in the
+  }                                                                                   
                                
               
The ECMAScript 3 reserved word list.
                                         
  var isReservedWord3 = makePredicate("abstract boolean byte char class double enum export extends final float goto implements import int interface long native package private protected public short static super synchronized throws transient volatile");
                                                                                   
                                
               
ECMAScript 5 reserved words.
                                         
  var isReservedWord5 = makePredicate("class enum extends super const export import");
                                                                                   
                                
               
The additional reserved words in strict mode.
                                         
  var isStrictReservedWord = makePredicate("implements interface let package private protected public static yield");
                                                                                   
                                
               
The forbidden variable names in strict mode.
                                         
  var isStrictBadIdWord = makePredicate("eval arguments");
                                                                                   
                                
               
And the keywords.
                                         
  var isKeyword = makePredicate("break case catch continue debugger default do else finally for function if return switch throw try var while with null true false instanceof typeof void delete new in");
                                                                                   
                                
               
Character categories
                                         
                                                                                   
                                
               
Big ugly regular expressions that match characters in the
 whitespace, identifier, and identifier-start categories. These
 are only applied when a character is found to actually have a
 code point above 128.
                                         
  var nonASCIIwhitespace = /[\u1680\u180E\u2000-\u200A\u202F\u205F\u3000\uFEFF]/;
   var nonASCIIidentifierStartChars = "\xaa\xb5\xba\xc0-\xd6\xd8-\xf6\xf8-\u02c1\u02c6-\u02d1\u02e0-\u02e4\u02ec\u02ee\u0370-\u0374\u0376\u0377\u037a-\u037d\u0386\u0388-\u038a\u038c\u038e-\u03a1\u03a3-\u03f5\u03f7-\u0481\u048a-\u0527\u0531-\u0556\u0559\u0561-\u0587\u05d0-\u05ea\u05f0-\u05f2\u0620-\u064a\u066e\u066f\u0671-\u06d3\u06d5\u06e5\u06e6\u06ee\u06ef\u06fa-\u06fc\u06ff\u0710\u0712-\u072f\u074d-\u07a5\u07b1\u07ca-\u07ea\u07f4\u07f5\u07fa\u0800-\u0815\u081a\u0824\u0828\u0840-\u0858\u08a0\u08a2-\u08ac\u0904-\u0939\u093d\u0950\u0958-\u0961\u0971-\u0977\u0979-\u097f\u0985-\u098c\u098f\u0990\u0993-\u09a8\u09aa-\u09b0\u09b2\u09b6-\u09b9\u09bd\u09ce\u09dc\u09dd\u09df-\u09e1\u09f0\u09f1\u0a05-\u0a0a\u0a0f\u0a10\u0a13-\u0a28\u0a2a-\u0a30\u0a32\u0a33\u0a35\u0a36\u0a38\u0a39\u0a59-\u0a5c\u0a5e\u0a72-\u0a74\u0a85-\u0a8d\u0a8f-\u0a91\u0a93-\u0aa8\u0aaa-\u0ab0\u0ab2\u0ab3\u0ab5-\u0ab9\u0abd\u0ad0\u0ae0\u0ae1\u0b05-\u0b0c\u0b0f\u0b10\u0b13-\u0b28\u0b2a-\u0b30\u0b32\u0b33\u0b35-\u0b39\u0b3d\u0b5c\u0b5d\u0b5f-\u0b61\u0b71\u0b83\u0b85-\u0b8a\u0b8e-\u0b90\u0b92-\u0b95\u0b99\u0b9a\u0b9c\u0b9e\u0b9f\u0ba3\u0ba4\u0ba8-\u0baa\u0bae-\u0bb9\u0bd0\u0c05-\u0c0c\u0c0e-\u0c10\u0c12-\u0c28\u0c2a-\u0c33\u0c35-\u0c39\u0c3d\u0c58\u0c59\u0c60\u0c61\u0c85-\u0c8c\u0c8e-\u0c90\u0c92-\u0ca8\u0caa-\u0cb3\u0cb5-\u0cb9\u0cbd\u0cde\u0ce0\u0ce1\u0cf1\u0cf2\u0d05-\u0d0c\u0d0e-\u0d10\u0d12-\u0d3a\u0d3d\u0d4e\u0d60\u0d61\u0d7a-\u0d7f\u0d85-\u0d96\u0d9a-\u0db1\u0db3-\u0dbb\u0dbd\u0dc0-\u0dc6\u0e01-\u0e30\u0e32\u0e33\u0e40-\u0e46\u0e81\u0e82\u0e84\u0e87\u0e88\u0e8a\u0e8d\u0e94-\u0e97\u0e99-\u0e9f\u0ea1-\u0ea3\u0ea5\u0ea7\u0eaa\u0eab\u0ead-\u0eb0\u0eb2\u0eb3\u0ebd\u0ec0-\u0ec4\u0ec6\u0edc-\u0edf\u0f00\u0f40-\u0f47\u0f49-\u0f6c\u0f88-\u0f8c\u1000-\u102a\u103f\u1050-\u1055\u105a-\u105d\u1061\u1065\u1066\u106e-\u1070\u1075-\u1081\u108e\u10a0-\u10c5\u10c7\u10cd\u10d0-\u10fa\u10fc-\u1248\u124a-\u124d\u1250-\u1256\u1258\u125a-\u125d\u1260-\u1288\u128a-\u128d\u1290-\u12b0\u12b2-\u12b5\u12b8-\u12be\u12c0\u12c2-\u12c5\u12c8-\u12d6\u12d8-\u1310\u1312-\u1315\u1318-\u135a\u1380-\u138f\u13a0-\u13f4\u1401-\u166c\u166f-\u167f\u1681-\u169a\u16a0-\u16ea\u16ee-\u16f0\u1700-\u170c\u170e-\u1711\u1720-\u1731\u1740-\u1751\u1760-\u176c\u176e-\u1770\u1780-\u17b3\u17d7\u17dc\u1820-\u1877\u1880-\u18a8\u18aa\u18b0-\u18f5\u1900-\u191c\u1950-\u196d\u1970-\u1974\u1980-\u19ab\u19c1-\u19c7\u1a00-\u1a16\u1a20-\u1a54\u1aa7\u1b05-\u1b33\u1b45-\u1b4b\u1b83-\u1ba0\u1bae\u1baf\u1bba-\u1be5\u1c00-\u1c23\u1c4d-\u1c4f\u1c5a-\u1c7d\u1ce9-\u1cec\u1cee-\u1cf1\u1cf5\u1cf6\u1d00-\u1dbf\u1e00-\u1f15\u1f18-\u1f1d\u1f20-\u1f45\u1f48-\u1f4d\u1f50-\u1f57\u1f59\u1f5b\u1f5d\u1f5f-\u1f7d\u1f80-\u1fb4\u1fb6-\u1fbc\u1fbe\u1fc2-\u1fc4\u1fc6-\u1fcc\u1fd0-\u1fd3\u1fd6-\u1fdb\u1fe0-\u1fec\u1ff2-\u1ff4\u1ff6-\u1ffc\u2071\u207f\u2090-\u209c\u2102\u2107\u210a-\u2113\u2115\u2119-\u211d\u2124\u2126\u2128\u212a-\u212d\u212f-\u2139\u213c-\u213f\u2145-\u2149\u214e\u2160-\u2188\u2c00-\u2c2e\u2c30-\u2c5e\u2c60-\u2ce4\u2ceb-\u2cee\u2cf2\u2cf3\u2d00-\u2d25\u2d27\u2d2d\u2d30-\u2d67\u2d6f\u2d80-\u2d96\u2da0-\u2da6\u2da8-\u2dae\u2db0-\u2db6\u2db8-\u2dbe\u2dc0-\u2dc6\u2dc8-\u2dce\u2dd0-\u2dd6\u2dd8-\u2dde\u2e2f\u3005-\u3007\u3021-\u3029\u3031-\u3035\u3038-\u303c\u3041-\u3096\u309d-\u309f\u30a1-\u30fa\u30fc-\u30ff\u3105-\u312d\u3131-\u318e\u31a0-\u31ba\u31f0-\u31ff\u3400-\u4db5\u4e00-\u9fcc\ua000-\ua48c\ua4d0-\ua4fd\ua500-\ua60c\ua610-\ua61f\ua62a\ua62b\ua640-\ua66e\ua67f-\ua697\ua6a0-\ua6ef\ua717-\ua71f\ua722-\ua788\ua78b-\ua78e\ua790-\ua793\ua7a0-\ua7aa\ua7f8-\ua801\ua803-\ua805\ua807-\ua80a\ua80c-\ua822\ua840-\ua873\ua882-\ua8b3\ua8f2-\ua8f7\ua8fb\ua90a-\ua925\ua930-\ua946\ua960-\ua97c\ua984-\ua9b2\ua9cf\uaa00-\uaa28\uaa40-\uaa42\uaa44-\uaa4b\uaa60-\uaa76\uaa7a\uaa80-\uaaaf\uaab1\uaab5\uaab6\uaab9-\uaabd\uaac0\uaac2\uaadb-\uaadd\uaae0-\uaaea\uaaf2-\uaaf4\uab01-\uab06\uab09-\uab0e\uab11-\uab16\uab20-\uab26\uab28-\uab2e\uabc0-\uabe2\uac00-\ud7a3\ud7b0-\ud7c6\ud7cb-\ud7fb\uf900-\ufa6d\ufa70-\ufad9\ufb00-\ufb06\ufb13-\ufb17\ufb1d\ufb1f-\ufb28\ufb2a-\ufb36\ufb38-\ufb3c\ufb3e\ufb40\ufb41\ufb43\ufb44\ufb46-\ufbb1\ufbd3-\ufd3d\ufd50-\ufd8f\ufd92-\ufdc7\ufdf0-\ufdfb\ufe70-\ufe74\ufe76-\ufefc\uff21-\uff3a\uff41-\uff5a\uff66-\uffbe\uffc2-\uffc7\uffca-\uffcf\uffd2-\uffd7\uffda-\uffdc";
   var nonASCIIidentifierChars = "\u0371-\u0374\u0483-\u0487\u0591-\u05bd\u05bf\u05c1\u05c2\u05c4\u05c5\u05c7\u0610-\u061a\u0620-\u0649\u0672-\u06d3\u06e7-\u06e8\u06fb-\u06fc\u0730-\u074a\u0800-\u0814\u081b-\u0823\u0825-\u0827\u0829-\u082d\u0840-\u0857\u08e4-\u08fe\u0900-\u0903\u093a-\u093c\u093e-\u094f\u0951-\u0957\u0962-\u0963\u0966-\u096f\u0981-\u0983\u09bc\u09be-\u09c4\u09c7\u09c8\u09d7\u09df-\u09e0\u0a01-\u0a03\u0a3c\u0a3e-\u0a42\u0a47\u0a48\u0a4b-\u0a4d\u0a51\u0a66-\u0a71\u0a75\u0a81-\u0a83\u0abc\u0abe-\u0ac5\u0ac7-\u0ac9\u0acb-\u0acd\u0ae2-\u0ae3\u0ae6-\u0aef\u0b01-\u0b03\u0b3c\u0b3e-\u0b44\u0b47\u0b48\u0b4b-\u0b4d\u0b56\u0b57\u0b5f-\u0b60\u0b66-\u0b6f\u0b82\u0bbe-\u0bc2\u0bc6-\u0bc8\u0bca-\u0bcd\u0bd7\u0be6-\u0bef\u0c01-\u0c03\u0c46-\u0c48\u0c4a-\u0c4d\u0c55\u0c56\u0c62-\u0c63\u0c66-\u0c6f\u0c82\u0c83\u0cbc\u0cbe-\u0cc4\u0cc6-\u0cc8\u0cca-\u0ccd\u0cd5\u0cd6\u0ce2-\u0ce3\u0ce6-\u0cef\u0d02\u0d03\u0d46-\u0d48\u0d57\u0d62-\u0d63\u0d66-\u0d6f\u0d82\u0d83\u0dca\u0dcf-\u0dd4\u0dd6\u0dd8-\u0ddf\u0df2\u0df3\u0e34-\u0e3a\u0e40-\u0e45\u0e50-\u0e59\u0eb4-\u0eb9\u0ec8-\u0ecd\u0ed0-\u0ed9\u0f18\u0f19\u0f20-\u0f29\u0f35\u0f37\u0f39\u0f41-\u0f47\u0f71-\u0f84\u0f86-\u0f87\u0f8d-\u0f97\u0f99-\u0fbc\u0fc6\u1000-\u1029\u1040-\u1049\u1067-\u106d\u1071-\u1074\u1082-\u108d\u108f-\u109d\u135d-\u135f\u170e-\u1710\u1720-\u1730\u1740-\u1750\u1772\u1773\u1780-\u17b2\u17dd\u17e0-\u17e9\u180b-\u180d\u1810-\u1819\u1920-\u192b\u1930-\u193b\u1951-\u196d\u19b0-\u19c0\u19c8-\u19c9\u19d0-\u19d9\u1a00-\u1a15\u1a20-\u1a53\u1a60-\u1a7c\u1a7f-\u1a89\u1a90-\u1a99\u1b46-\u1b4b\u1b50-\u1b59\u1b6b-\u1b73\u1bb0-\u1bb9\u1be6-\u1bf3\u1c00-\u1c22\u1c40-\u1c49\u1c5b-\u1c7d\u1cd0-\u1cd2\u1d00-\u1dbe\u1e01-\u1f15\u200c\u200d\u203f\u2040\u2054\u20d0-\u20dc\u20e1\u20e5-\u20f0\u2d81-\u2d96\u2de0-\u2dff\u3021-\u3028\u3099\u309a\ua640-\ua66d\ua674-\ua67d\ua69f\ua6f0-\ua6f1\ua7f8-\ua800\ua806\ua80b\ua823-\ua827\ua880-\ua881\ua8b4-\ua8c4\ua8d0-\ua8d9\ua8f3-\ua8f7\ua900-\ua909\ua926-\ua92d\ua930-\ua945\ua980-\ua983\ua9b3-\ua9c0\uaa00-\uaa27\uaa40-\uaa41\uaa4c-\uaa4d\uaa50-\uaa59\uaa7b\uaae0-\uaae9\uaaf2-\uaaf3\uabc0-\uabe1\uabec\uabed\uabf0-\uabf9\ufb20-\ufb28\ufe00-\ufe0f\ufe20-\ufe26\ufe33\ufe34\ufe4d-\ufe4f\uff10-\uff19\uff3f";
   var nonASCIIidentifierStart = new RegExp("[" + nonASCIIidentifierStartChars + "]");
-  var nonASCIIidentifier = new RegExp("[" + nonASCIIidentifierStartChars + nonASCIIidentifierChars + "]");
                                                                                   
                                
               
Whether a single character denotes a newline.
                                         
  var newline = /[\n\r\u2028\u2029]/;
                                                                                   
                                
               
Matches a whole line break (where CRLF is considered a single
-line break). Used to count lines.
                                         
  var lineBreak = /\r\n?|[\n\r\u2028\u2029]/g;
                                                                                   
                                
               
Test whether a given character code starts an identifier.
                                         
  function isIdentifierStart(code) {
+  var nonASCIIidentifier = new RegExp("[" + nonASCIIidentifierStartChars + nonASCIIidentifierChars + "]");
                                                                                   
                                
               
Whether a single character denotes a newline.
                                         
  var newline = /[\n\r\u2028\u2029]/;
                                                                                   
                                
               
Matches a whole line break (where CRLF is considered a single
+line break). Used to count lines.
                                         
  var lineBreak = /\r\n?|[\n\r\u2028\u2029]/g;
                                                                                   
                                
               
Test whether a given character code starts an identifier.
                                         
  function isIdentifierStart(code) {
     return (code >= 65 && code <= 90) || (code >= 97 && code <= 122) ||
       code === 36 || code === 95 ||
       (code >= 0xaa && nonASCIIidentifierStart.test(String.fromCharCode(code)));
-  }
                                                                                   
                                
               
Test whether a given character is part of an identifier.
                                         
  function isIdentifierChar(ch) {
+  }
                                                                                   
                                
               
Test whether a given character is part of an identifier.
                                         
  function isIdentifierChar(ch) {
     return ((ch >= "a" && ch <= "z") || (ch >= "A" && ch <= "Z") ||
             (ch >= "0" && ch <= "9") || ch === "$" || ch === "_" ||
             (ch >= "\xaa" && nonASCIIidentifier.test(ch)));
-  }
                                                                                   
                                
               
Tokenizer
                                         
                                                                                   
                                
               
These are used when options.linePositions is on, in order to
-track the current line number and start of line offset, so that
-tokStart and tokEnd refer to position objects indead of
-integer offsets.
                                         
  function nextLineStart() {
+  }
                                                                                   
                                
               
Tokenizer
                                         
                                                                                   
                                
               
These are used when options.locations is on, in order to track
+the current line number and start of line offset, in order to set
+tokStartLoc and tokEndLoc.
                                         
  function nextLineStart() {
     lineBreak.lastIndex = tokLineStart;
     var match = lineBreak.exec(input);
     return match ? match.index + match[0].length : input.length + 1;
   }
 
-  function curLinePos() {
+  function curLineLoc() {
     while (tokLineStartNext <= tokPos) {
       ++tokCurLine;
       tokLineStart = tokLineStartNext;
       tokLineStartNext = nextLineStart();
     }
-    return {offset: tokPos, line: tokCurLine, column: tokPos - tokLineStart};
-  }
                                                                                   
                                
               
Reset the token state. Used at the start of a parse.
                                         
  function initTokenState() {
+    return {line: tokCurLine, column: tokPos - tokLineStart};
+  }
                                                                                   
                                
               
Reset the token state. Used at the start of a parse.
                                         
  function initTokenState() {
     tokCurLine = 1;
     tokPos = tokLineStart = 0;
     tokLineStartNext = nextLineStart();
     tokRegexpAllowed = true;
     tokComments = null;
     skipSpace();
-  }
                                                                                   
                                
               
Called at the end of every token. Sets tokEnd, tokVal,
+  }                                                                                   
                                
               
Called at the end of every token. Sets tokEnd, tokVal,
 tokCommentsAfter, and tokRegexpAllowed, and skips the space
 after the token, so that the next one's tokStart will point at
 the right position.
                                         
  function finishToken(type, val) {
-    tokEnd = options.linePositions ? curLinePos() : tokPos;
+    tokEnd = tokPos;
+    if (options.locations) tokEndLoc = curLineLoc();
     tokType = type;
     skipSpace();
     tokVal = val;
@@ -248,7 +244,7 @@ the right position.
                          
     while (tokPos < inputLen && !newline.test(input.charAt(tokPos))) ++tokPos;
     if (options.trackComments)
       (tokComments || (tokComments = [])).push(input.slice(start, tokPos));
-  }
                                                                                   
                                
               
Called at the start of the parse and after every token. Skips
+  }                                                                                   
                                
               
Called at the start of the parse and after every token. Skips
 whitespace and comments, and, if options.trackComments is on,
 will store all skipped comments in tokComments.
                                         
  function skipSpace() {
     tokComments = null;
@@ -268,7 +264,7 @@ will store all skipped comments in tokComments.
             break;
       }
     }
-  }
                                                                                   
                                
               
Token reading
                                         
                                                                                   
                                
               
This is the function that is called to fetch the next token. It
+  }                                                                                   
                                
               
Token reading
                                         
                                                                                   
                                
               
This is the function that is called to fetch the next token. It
 is somewhat obscure, because it works in character codes rather
 than characters, and because operator parsing has been inlined
 into it.

@@ -277,20 +273,21 @@ into it.

 
 
The forceRegexp parameter is used in the one case where the
 tokRegexpAllowed trick does not work. See parseStatement.
                                         
  function readToken(forceRegexp) {
-    tokStart = options.linePositions ? curLinePos() : tokPos;
+    tokStart = tokPos;
+    if (options.locations) tokStartLoc = curLineLoc();
     tokCommentsBefore = tokComments;
     if (forceRegexp) return readRegexp();
     if (tokPos >= inputLen) return finishToken(_eof);
 
-    var code = input.charCodeAt(tokPos);
                                                                                   
                                
               
Identifier or keyword. '\uXXXX' sequences are allowed in
+    var code = input.charCodeAt(tokPos);                                                                                   
                                
               
Identifier or keyword. '\uXXXX' sequences are allowed in
 identifiers, so '\' also dispatches to that.
                                         
    if (isIdentifierStart(code) || code === 92 /* '\' */) return readWord();
     var next = input.charCodeAt(tokPos+1);
 
-    switch(code) {
                                                                                   
                                
               
The interpretation of a dot depends on whether it is followed
+    switch(code) {                                                                                   
                                
               
The interpretation of a dot depends on whether it is followed
 by a digit.
                                         
    case 46: // '.'
       if (next >= 48 && next <= 57) return readNumber(String.fromCharCode(code));
       ++tokPos;
-      return finishToken(_dot);
                                                                                   
                                
               
Punctuation tokens.
                                         
    case 40: ++tokPos; return finishToken(_parenL);
+      return finishToken(_dot);
                                                                                   
                                
               
Punctuation tokens.
                                         
    case 40: ++tokPos; return finishToken(_parenL);
     case 41: ++tokPos; return finishToken(_parenR);
     case 59: ++tokPos; return finishToken(_semi);
     case 44: ++tokPos; return finishToken(_comma);
@@ -299,11 +296,11 @@ by a digit.
                                         case 123: ++tokPos; return finishToken(_braceL);
     case 125: ++tokPos; return finishToken(_braceR);
     case 58: ++tokPos; return finishToken(_colon);
-    case 63: ++tokPos; return finishToken(_question);
                                                                                   
                                
               
'0x' is a hexadecimal number.
                                         
    case 48: // '0'
-      if (next === 120 || next === 88) return readHexNumber();
                                                                                   
                                
               
Anything else beginning with a digit is an integer, octal
+    case 63: ++tokPos; return finishToken(_question);                                                                                   
                                
               
'0x' is a hexadecimal number.
                                         
    case 48: // '0'
+      if (next === 120 || next === 88) return readHexNumber();
                                                                                   
                                
               
Anything else beginning with a digit is an integer, octal
 number, or float.
                                         
    case 49: case 50: case 51: case 52: case 53: case 54: case 55: case 56: case 57: // 1-9
-      return readNumber(String.fromCharCode(code));
                                                                                   
                                
               
Quotes produce strings.
                                         
    case 34: case 39: // '"', "'"
-      return readString(String.fromCharCode(code));
                                                                                   
                                
               
Operators are parsed inline in tiny state machines. '=' (61) is
+      return readNumber(String.fromCharCode(code));                                                                                   
                                
               
Quotes produce strings.
                                         
    case 34: case 39: // '"', "'"
+      return readString(String.fromCharCode(code));
                                                                                   
                                
               
Operators are parsed inline in tiny state machines. '=' (61) is
 often referred to. finishOp simply skips the amount of
 characters it is given as second argument, and returns a token
 of the type given by its first argument.
                                         
    case 47: // '/'
@@ -347,7 +344,7 @@ of the type given by its first argument.
                          case 126: // '~'
       if (next === 61) return finishOp(_assign, 2);
       return finishOp(_prefix, 1);
-    }
                                                                                   
                                
               
If we are here, we either found a non-ASCII identifier
+    }                                                                                   
                                
               
If we are here, we either found a non-ASCII identifier
 character, or something that's entirely disallowed.
                                         
    var ch = String.fromCharCode(code);
     if (ch === "\\" || nonASCIIidentifierStart.test(ch)) return readWord();
     raise(tokPos, "Unexpected character '" + ch + "'");
@@ -357,7 +354,7 @@ character, or something that's entirely disallowed.
             
     var str = input.slice(tokPos, tokPos + size);
     tokPos += size;
     finishToken(type, str);
-  }
                                                                                   
                                
               
Parse a regular expression. Some context-awareness is necessary,
+  }                                                                                   
                                
               
Parse a regular expression. Some context-awareness is necessary,
 since a '/' inside a '[]' set does not end the expression.
                                         
  function readRegexp() {
     var content = "", escaped, inClass, start = tokPos;
     for (;;) {
@@ -373,11 +370,11 @@ since a '/' inside a '[]' set does not end the expression.
             
       ++tokPos;
     }
     var content = input.slice(start, tokPos);
-    ++tokPos;
                                                                                   
                                
               
Need to use readWord1 because '\uXXXX' sequences are allowed
+    ++tokPos;                                                                                   
                                
               
Need to use readWord1 because '\uXXXX' sequences are allowed
 here (don't ask).
                                         
    var mods = readWord1();
     if (mods && !/^[gmsiy]*$/.test(mods)) raise(start, "Invalid regexp flag");
     return finishToken(_regexp, new RegExp(content, mods));
-  }
                                                                                   
                                
               
Read an integer in the given radix. Return null if zero digits
+  }                                                                                   
                                
               
Read an integer in the given radix. Return null if zero digits
 were read, the integer value otherwise. When len is given, this
 will return null unless the integer has exactly len digits.
                                         
  function readInt(radix, len) {
     var start = tokPos, total = 0;
@@ -402,7 +399,7 @@ will return null unless the integer has exactly len di
     if (val == null) raise(tokStart + 2, "Expected hexadecimal number");
     if (isIdentifierStart(input.charCodeAt(tokPos))) raise(tokPos, "Identifier directly after number");
     return finishToken(_num, val);
-  }
                                                                                   
                                
               
Read an integer, octal integer, or floating-point number.
                                         
  
+  }
                                                                                   
                                
               
Read an integer, octal integer, or floating-point number.
                                         
  
   function readNumber(ch) {
     var start = tokPos, isFloat = ch === ".";
     if (!isFloat && readInt(10) == null) raise(start, "Invalid number");
@@ -426,7 +423,7 @@ will return null unless the integer has exactly len di
     else if (/[89]/.test(str) || strict) raise(start, "Invalid number");
     else val = parseInt(str, 8);
     return finishToken(_num, val);
-  }
                                                                                   
                                
               
Read a string value, interpreting backslash-escapes.
                                         
  function readString(quote) {
+  }
                                                                                   
                                
               
Read a string value, interpreting backslash-escapes.
                                         
  function readString(quote) {
     tokPos++;
     var str = "";
     for (;;) {
@@ -472,13 +469,13 @@ will return null unless the integer has exactly len di
         ++tokPos;
       }
     }
-  }
                                                                                   
                                
               
Used to read character escape sequences ('\x', '\u', '\U').
                                         
  function readHexChar(len) {
+  }
                                                                                   
                                
               
Used to read character escape sequences ('\x', '\u', '\U').
                                         
  function readHexChar(len) {
     var n = readInt(16, len);
     if (n === null) raise(tokStart, "Bad character escape sequence");
     return String.fromCharCode(n);
-  }
                                                                                   
                                
               
Used to signal to callers of readWord1 whether the word
+  }                                                                                   
                                
               
Used to signal to callers of readWord1 whether the word
 contained any escape sequences. This is needed because words with
-escape sequences must not be interpreted as keywords.
                                         
  var containsEsc;
                                                                                   
                                
               
Read an identifier, and return it as a string. Sets containsEsc
+escape sequences must not be interpreted as keywords.
                                         
  var containsEsc;
                                                                                   
                                
               
Read an identifier, and return it as a string. Sets containsEsc
 to whether the word contained a '\u' escape.

 
 
Only builds up the word character-by-character when it actually
@@ -507,7 +504,7 @@ containeds an escape, as a micro-optimization.
             
       first = false;
     }
     return containsEsc ? word : input.slice(start, tokPos);
-  }                                                                                   
                                
               
Read an identifier or keyword token. Will check for reserved
+  }                                                                                   
                                
               
Read an identifier or keyword token. Will check for reserved
 words when necessary.
                                         
  function readWord() {
     var word = readWord1();
     var type = _name;
@@ -519,7 +516,7 @@ words when necessary.
                          
         raise(tokStart, "The keyword '" + word + "' is reserved");
     }
     return finishToken(type, word);
-  }
                                                                                   
                                
               
Parser
                                         
                                                                                   
                                
               
A recursive descent parser operates by defining functions for all
+  }                                                                                   
                                
               
Parser
                                         
                                                                                   
                                
               
A recursive descent parser operates by defining functions for all
 syntactic elements, and recursively calling those, each function
 advancing the input stream and returning an AST node. Precedence
 of constructs (for example, the fact that !x[1] means !(x[1])
@@ -533,26 +530,29 @@ way, it'll receive the node for x[1] already parsed, and wraps
 operator precedence, because it is much more compact than using
 the technique outlined above, which uses different, nesting
 functions to specify precedence, for all of the ten binary
-precedence levels that JavaScript defines.
                                         
                                                                                   
                                
               
Parser utilities
                                         
                                                                                   
                                
               
Continue to the next token.
                                         
  
+precedence levels that JavaScript defines.
                                         
                                                                                   
                                
               
Parser utilities
                                         
                                                                                   
                                
               
Continue to the next token.
                                         
  
   function next() {
     lastStart = tokStart;
     lastEnd = tokEnd;
+    lastEndLoc = tokEndLoc;
     readToken();
-  }
                                                                                   
                                
               
Enter strict mode. Re-reads the next token to please pedantic
+  }
                                                                                   
                                
               
Enter strict mode. Re-reads the next token to please pedantic
 tests ("use strict"; 010; -- should fail).
                                         
  function setStrict(strct) {
     strict = strct;
-    tokPos = options.linePositions ? lastEnd.offset : lastEnd;
+    tokPos = lastEnd;
     skipSpace();
     readToken();
-  }
                                                                                   
                                
               
Start an AST node, attaching a start offset and optionally a
+  }                                                                                   
                                
               
Start an AST node, attaching a start offset and optionally a
 commentsBefore property to it.
                                         
  function startNode() {
     var node = {type: null, start: tokStart, end: null};
     if (options.trackComments && tokCommentsBefore) {
       node.commentsBefore = tokCommentsBefore;
       tokCommentsBefore = null;
     }
+    if (options.locations)
+      node.loc = {start: tokStartLoc, end: null};
     return node;
-  }
                                                                                   
                                
               
Start a node whose start offset/comments information should be
+  }                                                                                   
                                
               
Start a node whose start offset/comments information should be
 based on the start of another node. For example, a binary
 operator node is only started after its left-hand side has
 already been parsed.
                                         
  function startNodeFrom(other) {
@@ -561,8 +561,11 @@ already been parsed.
                          
       node.commentsBefore = other.commentsBefore;
       other.commentsBefore = null;
     }
+    if (options.locations)
+      node.loc = {start: other.loc.start, end: null};
+
     return node;
-  }
                                                                                   
                                
               
Finish an AST node, adding type, end, and commentsAfter
+  }                                                                                   
                                
               
Finish an AST node, adding type, end, and commentsAfter
 properties.

 
 
We keep track of the last node that we finished, in order
@@ -583,40 +586,42 @@ operator node, not the second literal node.
                          }
       lastFinishedNode = node;
     }
+    if (options.locations)
+      node.loc.end = lastEndLoc;
     return node;
-  }                                                                                   
                                
               
Test whether a statement node is the string literal "use strict".
                                         
  function isUseStrict(stmt) {
+  }
                                                                                   
                                
               
Test whether a statement node is the string literal "use strict".
                                         
  function isUseStrict(stmt) {
     return options.ecmaVersion >= 5 && stmt.type === "ExpressionStatement" &&
       stmt.expression.type === "Literal" && stmt.expression.value === "use strict";
-  }
                                                                                   
                                
               
Predicate that tests whether the next token is of the given
+  }                                                                                   
                                
               
Predicate that tests whether the next token is of the given
 type, and if yes, consumes it as a side effect.
                                         
  function eat(type) {
     if (tokType === type) {
       next();
       return true;
     }
-  }
                                                                                   
                                
               
Test whether a semicolon can be inserted at the current position.
                                         
  function canInsertSemicolon() {
+  }
                                                                                   
                                
               
Test whether a semicolon can be inserted at the current position.
                                         
  function canInsertSemicolon() {
     return tokType === _eof || tokType === _braceR ||
       !options.strictSemicolons &&
-      newline.test(options.linePositions ? input.slice(lastEnd.offset, tokStart.offset)
-                                         : input.slice(lastEnd, tokStart));
-  }
                                                                                   
                                
               
Consume a semicolon, or, failing that, see if we are allowed to
+      newline.test(input.slice(lastEnd, tokStart));
+  }                                                                                   
                                
               
Consume a semicolon, or, failing that, see if we are allowed to
 pretend that there is a semicolon at this position.
                                         
  function semicolon() {
     if (!eat(_semi) && !canInsertSemicolon()) unexpected();
-  }
                                                                                   
                                
               
Expect a token of a given type. If found, consume it, otherwise,
+  }                                                                                   
                                
               
Expect a token of a given type. If found, consume it, otherwise,
 raise an unexpected token error.
                                         
  function expect(type) {
     if (tokType === type) next();
     else unexpected();
-  }
                                                                                   
                                
               
Raise an unexpected token error.
                                         
  function unexpected() {
+  }
                                                                                   
                                
               
Raise an unexpected token error.
                                         
  function unexpected() {
     raise(tokStart, "Unexpected token");
-  }
                                                                                   
                                
               
Verify that a node is an lval — something that can be assigned
+  }                                                                                   
                                
               
Verify that a node is an lval — something that can be assigned
 to.
                                         
  function checkLVal(expr) {
     if (expr.type !== "Identifier" && expr.type !== "MemberExpression")
       raise(expr.start, "Assigning to rvalue");
     if (strict && expr.type === "Identifier" && isStrictBadIdWord(expr.name))
       raise(expr.start, "Assigning to " + expr.name + " in strict mode");
-  }
                                                                                   
                                
               
Statement parsing
                                         
                                                                                   
                                
               
Parse a program. Initializes the parser, reads any number of
+  }                                                                                   
                                
               
Statement parsing
                                         
                                                                                   
                                
               
Parse a program. Initializes the parser, reads any number of
 statements, and wraps them in a Program node.
                                         
  function parseTopLevel() {
     initTokenState();
-    lastStart = lastEnd = options.linePositions ? curLinePos() : tokPos;
+    lastStart = lastEnd = tokPos;
+    if (options.locations) lastEndLoc = curLineLoc();
     inFunction = strict = null;
     labels = [];
     readToken();
@@ -632,7 +637,7 @@ statements, and wraps them in a Program node.
             
     return finishNode(node, "Program");
   };
 
-  var loopLabel = {kind: "loop"}, switchLabel = {kind: "switch"};
                                                                                   
                                
               
Parse a single statement.

+  var loopLabel = {kind: "loop"}, switchLabel = {kind: "switch"};                                                                                   
                                
               
Parse a single statement.

 
 
If expecting a statement and finding a slash operator, parse a
 regular expression literal. This is to handle cases like
@@ -641,7 +646,7 @@ does not help.
                          
     if (tokType === _slash)
       readToken(true);
 
-    var starttype = tokType, node = startNode();                                                                                   
                                
               
Most types of statements are recognized by the keyword they
+    var starttype = tokType, node = startNode();                                                                                   
                                
               
Most types of statements are recognized by the keyword they
 start with. Many are trivial to parse, some require a bit of
 complexity.
                                         
    switch (starttype) {
     case _break: case _continue:
@@ -652,7 +657,7 @@ complexity.
                                         else {
         node.label = parseIdent();
         semicolon();
-      }
                                                                                   
                                
               
Verify that there is an actual destination to break or
+      }                                                                                   
                                
               
Verify that there is an actual destination to break or
 continue to.
                                         
      for (var i = 0; i < labels.length; ++i) {
         var lab = labels[i];
         if ((node.label == null || lab.name === node.label.name) &&
@@ -672,7 +677,7 @@ continue to.
                                         <
       labels.pop();
       expect(_while);
       node.test = parseParenExpression();
-      return finishNode(node, "DoWhileStatement");
                                                                                   
                                
               
Disambiguating between a for and a for/in loop is
+      return finishNode(node, "DoWhileStatement");                                                                                   
                                
               
Disambiguating between a for and a for/in loop is
 non-trivial. Basically, we have to parse the init var
 statement or expression, disallowing the in operator (see
 the second parameter to parseExpression), and then check
@@ -708,7 +713,7 @@ a regular for loop.
                          case _return:
       if (!inFunction) raise(tokStart, "'return' outside of function");
-      next();                                                                                   
                                
               
In return (and break/continue), the keywords with
+      next();                                                                                   
                                
               
In return (and break/continue), the keywords with
 optional arguments, we eagerly look for a semicolon or the
 possibility to insert one.
                                         
      
       if (eat(_semi) || canInsertSemicolon()) node.argument = null;
@@ -720,7 +725,7 @@ possibility to insert one.
                          
       node.discriminant = parseParenExpression();
       node.cases = [];
       expect(_braceL);
-      labels.push(switchLabel);
                                                                                   
                                
               
Statements under must be grouped (by label) in SwitchCase
+      labels.push(switchLabel);                                                                                   
                                
               
Statements under must be grouped (by label) in SwitchCase
 nodes. cur is used to keep the node that we are currently
 adding statements to.
                                         
      
       for (var cur, sawDefault; tokType != _braceR;) {
@@ -798,7 +803,7 @@ adding statements to.
                          
 
     case _semi:
       next();
-      return finishNode(node, "EmptyStatement");
                                                                                   
                                
               
If the statement does not start with a statement keyword or a
+      return finishNode(node, "EmptyStatement");                                                                                   
                                
               
If the statement does not start with a statement keyword or a
 brace, it's an ExpressionStatement or LabeledStatement. We
 simply start parsing an expression, and afterwards, if the
 next token is a colon and the expression was a simple
@@ -818,13 +823,13 @@ Identifier node, we switch to interpreting it as a label.
             
         return finishNode(node, "ExpressionStatement");
       }
     }
-  }                                                                                   
                                
               
Used for constructs like switch and if that insist on
+  }                                                                                   
                                
               
Used for constructs like switch and if that insist on
 parentheses around their expression.
                                         
  function parseParenExpression() {
     expect(_parenL);
     var val = parseExpression();
     expect(_parenR);
     return val;
-  }
                                                                                   
                                
               
Parse a semicolon-enclosed block of statements, handling "use
+  }                                                                                   
                                
               
Parse a semicolon-enclosed block of statements, handling "use
 strict" declarations when allowStrict is true (used for
 function bodies).
                                         
  function parseBlock(allowStrict) {
     var node = startNode(), first = true, strict = false, oldStrict;
@@ -841,7 +846,7 @@ function bodies).
                          
     }
     if (strict && !oldStrict) setStrict(false);
     return finishNode(node, "BlockStatement");
-  }
                                                                                   
                                
               
Parse a regular for loop. The disambiguation code in
+  }                                                                                   
                                
               
Parse a regular for loop. The disambiguation code in
 parseStatement will already have parsed the init statement or
 expression.
                                         
  function parseFor(node, init) {
     node.init = init;
@@ -853,14 +858,14 @@ expression.
                                         node.body = parseStatement();
     labels.pop();
     return finishNode(node, "ForStatement");
-  }
                                                                                   
                                
               
Parse a for/in loop.
                                         
  function parseForIn(node, init) {
+  }
                                                                                   
                                
               
Parse a for/in loop.
                                         
  function parseForIn(node, init) {
     node.left = init;
     node.right = parseExpression();
     expect(_parenR);
     node.body = parseStatement();
     labels.pop();
     return finishNode(node, "ForInStatement");
-  }
                                                                                   
                                
               
Parse a list of variable declarations.
                                         
  function parseVar(node, noIn) {
+  }
                                                                                   
                                
               
Parse a list of variable declarations.
                                         
  function parseVar(node, noIn) {
     node.declarations = [];
     node.kind = "var";
     for (;;) {
@@ -873,11 +878,11 @@ expression.
                                         if (!eat(_comma)) break;
     }
     return finishNode(node, "VariableDeclaration");
-  }
                                                                                   
                                
               
Expression parsing
                                         
                                                                                   
                                
               
These nest, from the most general expression type at the top to
+  }                                                                                   
                                
               
Expression parsing
                                         
                                                                                   
                                
               
These nest, from the most general expression type at the top to
 'atomic', nondivisible expression types at the bottom. Most of
 the functions will simply let the function(s) below them parse,
 and, if the syntactic construct they handle is present, wrap
-the AST node that the inner parser gave them in another node.
                                         
                                                                                   
                                
               
Parse a full expression. The arguments are used to forbid comma
+the AST node that the inner parser gave them in another node.
                                         
                                                                                   
                                
               
Parse a full expression. The arguments are used to forbid comma
 sequences (in argument lists, array literals, or object literals)
 or the in operator (in for loops initalization expressions).
                                         
  function parseExpression(noComma, noIn) {
     var expr = parseMaybeAssign(noIn);
@@ -888,7 +893,7 @@ or the in operator (in for loops initalization expressions).

       return finishNode(node, "SequenceExpression");
     }
     return expr;
-  }
                                                                                   
                                
               
Parse an assignment expression. This includes applications of
+  }                                                                                   
                                
               
Parse an assignment expression. This includes applications of
 operators like +=.
                                         
  function parseMaybeAssign(noIn) {
     var left = parseMaybeConditional(noIn);
     if (tokType.isAssign) {
@@ -901,7 +906,7 @@ operators like +=.
                          return finishNode(node, "AssignmentExpression");
     }
     return left;
-  }
                                                                                   
                                
               
Parse a ternary conditional (?:) operator.
                                         
  function parseMaybeConditional(noIn) {
+  }
                                                                                   
                                
               
Parse a ternary conditional (?:) operator.
                                         
  function parseMaybeConditional(noIn) {
     var expr = parseExprOps(noIn);
     if (eat(_question)) {
       var node = startNodeFrom(expr);
@@ -912,9 +917,9 @@ operators like +=.
                          return finishNode(node, "ConditionalExpression");
     }
     return expr;
-  }
                                                                                   
                                
               
Start the precedence parser.
                                         
  function parseExprOps(noIn) {
+  }
                                                                                   
                                
               
Start the precedence parser.
                                         
  function parseExprOps(noIn) {
     return parseExprOp(parseMaybeUnary(noIn), -1, noIn);
-  }
                                                                                   
                                
               
Parse binary operators with the operator precedence parsing
+  }                                                                                   
                                
               
Parse binary operators with the operator precedence parsing
 algorithm. left is the left-hand side of the operator.
 minPrec provides context that allows the function to stop and
 defer further parser to one of its callers when it encounters an
@@ -932,7 +937,7 @@ operator that has a lower precedence than the set it is parsing.

       }
     }
     return left;
-  }                                                                                   
                                
               
Parse unary operators, both prefix and postfix.
                                         
  function parseMaybeUnary(noIn) {
+  }
                                                                                   
                                
               
Parse unary operators, both prefix and postfix.
                                         
  function parseMaybeUnary(noIn) {
     if (tokType.prefix) {
       var node = startNode(), update = tokType.isUpdate;
       node.operator = tokVal;
@@ -956,7 +961,7 @@ operator that has a lower precedence than the set it is parsing.

       expr = finishNode(node, "UpdateExpression");
     }
     return expr;
-  }
                                                                                   
                                
               
Parse call, dot, and []-subscript expressions.
                                         
  function parseExprSubscripts() {
+  }
                                                                                   
                                
               
Parse call, dot, and []-subscript expressions.
                                         
  function parseExprSubscripts() {
     return parseSubscripts(parseExprAtom());
   }
 
@@ -980,7 +985,7 @@ operator that has a lower precedence than the set it is parsing.

       node.arguments = parseExprList(_parenR, false);
       return parseSubscripts(finishNode(node, "CallExpression"), noCalls);
     } else return base;
-  }
                                                                                   
                                
               
Parse an atomic expression — either a single token that is an
+  }                                                                                   
                                
               
Parse an atomic expression — either a single token that is an
 expression, an expression started by a keyword like function or
 new, or an expression wrapped in punctuation like (), [],
 or {}.
                                         
  function parseExprAtom() {
@@ -1030,7 +1035,7 @@ or {}.
                          
     default:
       unexpected();
     }
-  }
                                                                                   
                                
               
New's precedence is slightly tricky. It must allow its argument
+  }                                                                                   
                                
               
New's precedence is slightly tricky. It must allow its argument
 to be a [] or dot subscript expression, but not a call — at
 least, not without wrapping it in parentheses. Thus, it uses the 
                                         
  function parseNew() {
     var node = startNode();
@@ -1039,7 +1044,7 @@ least, not without wrapping it in parentheses. Thus, it uses the 

     if (eat(_parenL)) node.arguments = parseExprList(_parenR, false);
     else node.arguments = [];
     return finishNode(node, "NewExpression");
-  }
                                                                                   
                                
               
Parse an object literal.
                                         
  function parseObj() {
+  }
                                                                                   
                                
               
Parse an object literal.
                                         
  function parseObj() {
     var node = startNode(), first = true, sawGetSet = false;
     node.properties = [];
     next();
@@ -1060,7 +1065,7 @@ least, not without wrapping it in parentheses. Thus, it uses the 

         prop.key = parsePropertyName();
         if (!tokType === _parenL) unexpected();
         prop.value = parseFunction(startNode(), false);
-      } else unexpected();
                                                                                   
                                
               
getters and setters are not allowed to clash — either with
+      } else unexpected();                                                                                   
                                
               
getters and setters are not allowed to clash — either with
 each other or with an init property — and in strict mode,
 init properties are also not allowed to be repeated.
                                         
      if (prop.key.type === "Identifier" && (strict || sawGetSet)) {
         for (var i = 0; i < node.properties.length; ++i) {
@@ -1081,7 +1086,7 @@ init properties are also not allowed to be repeated.
             
   function parsePropertyName() {
     if (tokType === _num || tokType === _string) return parseExprAtom();
     return parseIdent(true);
-  }
                                                                                   
                                
               
Parse a function declaration or literal (depending on the
+  }                                                                                   
                                
               
Parse a function declaration or literal (depending on the
 isStatement parameter).
                                         
  function parseFunction(node, isStatement) {
     if (tokType === _name) node.id = parseIdent();
     else if (isStatement) unexpected();
@@ -1092,11 +1097,11 @@ init properties are also not allowed to be repeated.
             
     while (!eat(_parenR)) {
       if (!first) expect(_comma); else first = false;
       node.params.push(parseIdent());
-    }
                                                                                   
                                
               
Start a new scope with regard to labels and the inFunction
+    }                                                                                   
                                
               
Start a new scope with regard to labels and the inFunction
 flag (restore them to their old value afterwards).
                                         
    var oldInFunc = inFunction, oldLabels = labels;
     inFunction = true; labels = [];
     node.body = parseBlock(true);
-    inFunction = oldInFunc; labels = oldLabels;
                                                                                   
                                
               
If this is a strict mode function, verify that argument names
+    inFunction = oldInFunc; labels = oldLabels;                                                                                   
                                
               
If this is a strict mode function, verify that argument names
 are not repeated, and it does not try to bind the words eval
 or arguments.
                                         
    if (strict || node.body.body.length && isUseStrict(node.body.body[0])) {
       for (var i = node.id ? -1 : 0; i < node.params.length; ++i) {
@@ -1109,7 +1114,7 @@ or arguments.
                          
     }
 
     return finishNode(node, isStatement ? "FunctionDeclaration" : "FunctionExpression");
-  }
                                                                                   
                                
               
Parses a comma-separated list of expressions, and returns them as
+  }                                                                                   
                                
               
Parses a comma-separated list of expressions, and returns them as
 an array. close is the token type that ends the list, and
 allowEmpty can be turned on to allow subsequent commas with
 nothing in between them to be parsed as null (which is needed
@@ -1125,7 +1130,7 @@ for array literals).
                          
       else elts.push(parseExpression(true));
     }
     return elts;
-  }                                                                                   
                                
               
Parse the next token as an identifier. If liberal is true (used
+  }                                                                                   
                                
               
Parse the next token as an identifier. If liberal is true (used
 when parsing properties), it will also convert keywords into
 identifiers.
                                         
  function parseIdent(liberal) {
     var node = startNode();
diff --git a/test/driver.js b/test/driver.js
index 78cc8e4328..285461f076 100644
--- a/test/driver.js
+++ b/test/driver.js
@@ -10,7 +10,7 @@
   };
 
   exports.runTests = function(callback) {
-    var opts = {linePositions: true};
+    var opts = {locations: true};
     for (var i = 0; i < tests.length; ++i) {
       var test = tests[i];
       try {
@@ -58,4 +58,27 @@
       }
     }
   }
+
+  function mangle(ast) {
+    if (typeof ast != "object" || !ast) return;
+    if (ast.slice) {
+      for (var i = 0; i < ast.length; ++i) mangle(ast[i]);
+    } else {
+      var loc = ast.start && ast.end && {start: ast.start, end: ast.end};
+      if (loc) { delete ast.start; delete ast.end; }
+      for (var name in ast) if (ast.hasOwnProperty(name)) mangle(ast[name]);
+      if (loc) ast.loc = loc;
+    }
+  }
+
+  exports.printTests = function() {
+    var out = "";
+    for (var i = 0; i < tests.length; ++i) {
+      if (tests[i].error) continue;
+      mangle(tests[i].ast);
+      out += "test(" + JSON.stringify(tests[i].code) + ", " + JSON.stringify(tests[i].ast, null, 2) + ");\n\n";
+    }
+    document.body.innerHTML = "";
+    document.body.appendChild(document.createElement("pre")).appendChild(document.createTextNode(out));
+  };
 })(typeof exports == "undefined" ? window : exports);
diff --git a/test/tests.js b/test/tests.js
index 096048263a..83ff7ec823 100644
--- a/test/tests.js
+++ b/test/tests.js
@@ -8,11358 +8,25720 @@ if (typeof exports != "undefined") {
 
 test("this\n", {
   type: "Program",
-  start: {
-    line: 1,
-    column: 0
-  },
   body: [
     {
       type: "ExpressionStatement",
-      start: {
-        line: 1,
-        column: 0
-      },
       expression: {
         type: "ThisExpression",
-        start: {line: 1, column: 0},
-        end: {line: 1, column: 4}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 4
+          }
+        }
       },
-      end: {line: 1, column: 4}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 4
+        }
+      }
     }
   ],
-  end: {line: 1, column: 4}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 4
+    }
+  }
 });
 
 test("null\n", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: null,
-        end: {line: 1, column: 4}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 4
+          }
+        }
       },
-      end: {line: 1, column: 4}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 4
+        }
+      }
     }
   ],
-  end: {line: 1, column: 4}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 4
+    }
+  }
 });
 
 test("\n    42\n\n", {
   type: "Program",
-  start: {line: 2, column: 4},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 2, column: 4},
       expression: {
         type: "Literal",
-        start: {line: 2, column: 4},
         value: 42,
-        end: {line: 2, column: 6}
+        loc: {
+          start: {
+            line: 2,
+            column: 4
+          },
+          end: {
+            line: 2,
+            column: 6
+          }
+        }
       },
-      end: {line: 2, column: 6}
+      loc: {
+        start: {
+          line: 2,
+          column: 4
+        },
+        end: {
+          line: 2,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 2, column: 6}
+  loc: {
+    start: {
+      line: 2,
+      column: 4
+    },
+    end: {
+      line: 2,
+      column: 6
+    }
+  }
 });
 
 test("(1 + 2 ) * 3", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 1},
         left: {
           type: "BinaryExpression",
-          start: {line: 1, column: 1},
           left: {
             type: "Literal",
-            start: {line: 1, column: 1},
             value: 1,
-            end: {line: 1, column: 2}
+            loc: {
+              start: {
+                line: 1,
+                column: 1
+              },
+              end: {
+                line: 1,
+                column: 2
+              }
+            }
           },
           operator: "+",
           right: {
             type: "Literal",
-            start: {line: 1, column: 5},
             value: 2,
-            end: {line: 1, column: 6}
+            loc: {
+              start: {
+                line: 1,
+                column: 5
+              },
+              end: {
+                line: 1,
+                column: 6
+              }
+            }
           },
-          end: {line: 1, column: 6}
+          loc: {
+            start: {
+              line: 1,
+              column: 1
+            },
+            end: {
+              line: 1,
+              column: 6
+            }
+          }
         },
         operator: "*",
         right: {
           type: "Literal",
-          start: {line: 1, column: 11},
           value: 3,
-          end: {line: 1, column: 12}
+          loc: {
+            start: {
+              line: 1,
+              column: 11
+            },
+            end: {
+              line: 1,
+              column: 12
+            }
+          }
         },
-        end: {line: 1, column: 12}
+        loc: {
+          start: {
+            line: 1,
+            column: 1
+          },
+          end: {
+            line: 1,
+            column: 12
+          }
+        }
       },
-      end: {line: 1, column: 12}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 12
+        }
+      }
     }
   ],
-  end: {line: 1, column: 12}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 12
+    }
+  }
 });
 
 test("x = []", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ArrayExpression",
-          start: {line: 1, column: 4},
           elements: [],
-          end: {line: 1, column: 6}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 6
+            }
+          }
         },
-        end: {line: 1, column: 6}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 6
+          }
+        }
       },
-      end: {line: 1, column: 6}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 1, column: 6}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 6
+    }
+  }
 });
 
 test("x = [ ]", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ArrayExpression",
-          start: {line: 1, column: 4},
           elements: [],
-          end: {line: 1, column: 7}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 7
+            }
+          }
         },
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
-      end: {line: 1, column: 7}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 7
+        }
+      }
     }
   ],
-  end: {line: 1, column: 7}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 7
+    }
+  }
 });
 
 test("x = [ 42 ]", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ArrayExpression",
-          start: {line: 1, column: 4},
           elements: [
             {
               type: "Literal",
-              start: {line: 1, column: 6},
               value: 42,
-              end: {line: 1, column: 8}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 6
+                },
+                end: {
+                  line: 1,
+                  column: 8
+                }
+              }
             }
           ],
-          end: {line: 1, column: 10}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 10
+            }
+          }
         },
-        end: {line: 1, column: 10}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 10
+          }
+        }
       },
-      end: {line: 1, column: 10}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 10
+        }
+      }
     }
   ],
-  end: {line: 1, column: 10}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 10
+    }
+  }
 });
 
 test("x = [ 42, ]", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ArrayExpression",
-          start: {line: 1, column: 4},
           elements: [
             {
               type: "Literal",
-              start: {line: 1, column: 6},
               value: 42,
-              end: {line: 1, column: 8}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 6
+                },
+                end: {
+                  line: 1,
+                  column: 8
+                }
+              }
             }
           ],
-          end: {line: 1, column: 11}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 11
+            }
+          }
         },
-        end: {line: 1, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 11
+          }
+        }
       },
-      end: {line: 1, column: 11}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 11
+        }
+      }
     }
   ],
-  end: {line: 1, column: 11}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 11
+    }
+  }
 });
 
 test("x = [ ,, 42 ]", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ArrayExpression",
-          start: {line: 1, column: 4},
           elements: [
             null,
             null,
             {
               type: "Literal",
-              start: {line: 1, column: 9},
               value: 42,
-              end: {line: 1, column: 11}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 9
+                },
+                end: {
+                  line: 1,
+                  column: 11
+                }
+              }
             }
           ],
-          end: {line: 1, column: 13}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 13
+            }
+          }
         },
-        end: {line: 1, column: 13}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 13
+          }
+        }
       },
-      end: {line: 1, column: 13}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 13
+        }
+      }
     }
   ],
-  end: {line: 1, column: 13}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 13
+    }
+  }
 });
 
 test("x = [ 1, 2, 3, ]", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ArrayExpression",
-          start: {line: 1, column: 4},
           elements: [
             {
               type: "Literal",
-              start: {line: 1, column: 6},
               value: 1,
-              end: {line: 1, column: 7}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 6
+                },
+                end: {
+                  line: 1,
+                  column: 7
+                }
+              }
             },
             {
               type: "Literal",
-              start: {line: 1, column: 9},
               value: 2,
-              end: {line: 1, column: 10}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 9
+                },
+                end: {
+                  line: 1,
+                  column: 10
+                }
+              }
             },
             {
               type: "Literal",
-              start: {line: 1, column: 12},
               value: 3,
-              end: {line: 1, column: 13}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 12
+                },
+                end: {
+                  line: 1,
+                  column: 13
+                }
+              }
             }
           ],
-          end: {line: 1, column: 16}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 16
+            }
+          }
         },
-        end: {line: 1, column: 16}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 16
+          }
+        }
       },
-      end: {line: 1, column: 16}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 16
+        }
+      }
     }
   ],
-  end: {line: 1, column: 16}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 16
+    }
+  }
 });
 
 test("x = [ 1, 2,, 3, ]", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ArrayExpression",
-          start: {line: 1, column: 4},
           elements: [
             {
               type: "Literal",
-              start: {line: 1, column: 6},
               value: 1,
-              end: {line: 1, column: 7}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 6
+                },
+                end: {
+                  line: 1,
+                  column: 7
+                }
+              }
             },
             {
               type: "Literal",
-              start: {line: 1, column: 9},
               value: 2,
-              end: {line: 1, column: 10}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 9
+                },
+                end: {
+                  line: 1,
+                  column: 10
+                }
+              }
             },
             null,
             {
               type: "Literal",
-              start: {line: 1, column: 13},
               value: 3,
-              end: {line: 1, column: 14}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 13
+                },
+                end: {
+                  line: 1,
+                  column: 14
+                }
+              }
             }
           ],
-          end: {line: 1, column: 17}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 17
+            }
+          }
         },
-        end: {line: 1, column: 17}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 17
+          }
+        }
       },
-      end: {line: 1, column: 17}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 17
+        }
+      }
     }
   ],
-  end: {line: 1, column: 17}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 17
+    }
+  }
 });
 
 test("日本語 = []", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "日本語",
-          end: {line: 1, column: 3}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 3
+            }
+          }
         },
         right: {
           type: "ArrayExpression",
-          start: {line: 1, column: 6},
           elements: [],
-          end: {line: 1, column: 8}
+          loc: {
+            start: {
+              line: 1,
+              column: 6
+            },
+            end: {
+              line: 1,
+              column: 8
+            }
+          }
         },
-        end: {line: 1, column: 8}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 8
+          }
+        }
       },
-      end: {line: 1, column: 8}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 8
+        }
+      }
     }
   ],
-  end: {line: 1, column: 8}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 8
+    }
+  }
 });
 
 test("T‿ = []", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "T‿",
-          end: {line: 1, column: 2}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 2
+            }
+          }
         },
         right: {
           type: "ArrayExpression",
-          start: {line: 1, column: 5},
           elements: [],
-          end: {line: 1, column: 7}
+          loc: {
+            start: {
+              line: 1,
+              column: 5
+            },
+            end: {
+              line: 1,
+              column: 7
+            }
+          }
         },
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
-      end: {line: 1, column: 7}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 7
+        }
+      }
     }
   ],
-  end: {line: 1, column: 7}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 7
+    }
+  }
 });
 
 test("T‌ = []", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "T‌",
-          end: {line: 1, column: 2}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 2
+            }
+          }
         },
         right: {
           type: "ArrayExpression",
-          start: {line: 1, column: 5},
           elements: [],
-          end: {line: 1, column: 7}
+          loc: {
+            start: {
+              line: 1,
+              column: 5
+            },
+            end: {
+              line: 1,
+              column: 7
+            }
+          }
         },
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
-      end: {line: 1, column: 7}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 7
+        }
+      }
     }
   ],
-  end: {line: 1, column: 7}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 7
+    }
+  }
 });
 
 test("T‍ = []", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "T‍",
-          end: {line: 1, column: 2}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 2
+            }
+          }
         },
         right: {
           type: "ArrayExpression",
-          start: {line: 1, column: 5},
           elements: [],
-          end: {line: 1, column: 7}
+          loc: {
+            start: {
+              line: 1,
+              column: 5
+            },
+            end: {
+              line: 1,
+              column: 7
+            }
+          }
         },
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
-      end: {line: 1, column: 7}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 7
+        }
+      }
     }
   ],
-  end: {line: 1, column: 7}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 7
+    }
+  }
 });
 
 test("ⅣⅡ = []", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "ⅣⅡ",
-          end: {line: 1, column: 2}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 2
+            }
+          }
         },
         right: {
           type: "ArrayExpression",
-          start: {line: 1, column: 5},
           elements: [],
-          end: {line: 1, column: 7}
+          loc: {
+            start: {
+              line: 1,
+              column: 5
+            },
+            end: {
+              line: 1,
+              column: 7
+            }
+          }
         },
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
-      end: {line: 1, column: 7}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 7
+        }
+      }
     }
   ],
-  end: {line: 1, column: 7}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 7
+    }
+  }
 });
 
 test("ⅣⅡ = []", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "ⅣⅡ",
-          end: {line: 1, column: 2}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 2
+            }
+          }
         },
         right: {
           type: "ArrayExpression",
-          start: {line: 1, column: 5},
           elements: [],
-          end: {line: 1, column: 7}
+          loc: {
+            start: {
+              line: 1,
+              column: 5
+            },
+            end: {
+              line: 1,
+              column: 7
+            }
+          }
         },
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
-      end: {line: 1, column: 7}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 7
+        }
+      }
     }
   ],
-  end: {line: 1, column: 7}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 7
+    }
+  }
 });
 
 test("x = {}", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ObjectExpression",
-          start: {line: 1, column: 4},
           properties: [],
-          end: {line: 1, column: 6}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 6
+            }
+          }
         },
-        end: {line: 1, column: 6}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 6
+          }
+        }
       },
-      end: {line: 1, column: 6}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 1, column: 6}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 6
+    }
+  }
 });
 
 test("x = { }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ObjectExpression",
-          start: {line: 1, column: 4},
           properties: [],
-          end: {line: 1, column: 7}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 7
+            }
+          }
         },
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
-      end: {line: 1, column: 7}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 7
+        }
+      }
     }
   ],
-  end: {line: 1, column: 7}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 7
+    }
+  }
 });
 
 test("x = { answer: 42 }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ObjectExpression",
-          start: {line: 1, column: 4},
           properties: [
             {
               key: {
                 type: "Identifier",
-                start: {line: 1, column: 6},
                 name: "answer",
-                end: {line: 1, column: 12}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 6
+                  },
+                  end: {
+                    line: 1,
+                    column: 12
+                  }
+                }
               },
               value: {
                 type: "Literal",
-                start: {line: 1, column: 14},
                 value: 42,
-                end: {line: 1, column: 16}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 14
+                  },
+                  end: {
+                    line: 1,
+                    column: 16
+                  }
+                }
               },
               kind: "init"
             }
           ],
-          end: {line: 1, column: 18}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 18
+            }
+          }
         },
-        end: {line: 1, column: 18}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 18
+          }
+        }
       },
-      end: {line: 1, column: 18}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 18
+        }
+      }
     }
   ],
-  end: {line: 1, column: 18}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 18
+    }
+  }
 });
 
 test("x = { if: 42 }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ObjectExpression",
-          start: {line: 1, column: 4},
           properties: [
             {
               key: {
                 type: "Identifier",
-                start: {line: 1, column: 6},
                 name: "if",
-                end: {line: 1, column: 8}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 6
+                  },
+                  end: {
+                    line: 1,
+                    column: 8
+                  }
+                }
               },
               value: {
                 type: "Literal",
-                start: {line: 1, column: 10},
                 value: 42,
-                end: {line: 1, column: 12}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 10
+                  },
+                  end: {
+                    line: 1,
+                    column: 12
+                  }
+                }
               },
               kind: "init"
             }
           ],
-          end: {line: 1, column: 14}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 14
+            }
+          }
         },
-        end: {line: 1, column: 14}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 14
+          }
+        }
       },
-      end: {line: 1, column: 14}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 14
+        }
+      }
     }
   ],
-  end: {line: 1, column: 14}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 14
+    }
+  }
 });
 
 test("x = { true: 42 }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ObjectExpression",
-          start: {line: 1, column: 4},
           properties: [
             {
               key: {
                 type: "Identifier",
-                start: {line: 1, column: 6},
                 name: "true",
-                end: {line: 1, column: 10}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 6
+                  },
+                  end: {
+                    line: 1,
+                    column: 10
+                  }
+                }
               },
               value: {
                 type: "Literal",
-                start: {line: 1, column: 12},
                 value: 42,
-                end: {line: 1, column: 14}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 12
+                  },
+                  end: {
+                    line: 1,
+                    column: 14
+                  }
+                }
               },
               kind: "init"
             }
           ],
-          end: {line: 1, column: 16}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 16
+            }
+          }
         },
-        end: {line: 1, column: 16}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 16
+          }
+        }
       },
-      end: {line: 1, column: 16}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 16
+        }
+      }
     }
   ],
-  end: {line: 1, column: 16}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 16
+    }
+  }
 });
 
 test("x = { false: 42 }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ObjectExpression",
-          start: {line: 1, column: 4},
           properties: [
             {
               key: {
                 type: "Identifier",
-                start: {line: 1, column: 6},
                 name: "false",
-                end: {line: 1, column: 11}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 6
+                  },
+                  end: {
+                    line: 1,
+                    column: 11
+                  }
+                }
               },
               value: {
                 type: "Literal",
-                start: {line: 1, column: 13},
                 value: 42,
-                end: {line: 1, column: 15}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 13
+                  },
+                  end: {
+                    line: 1,
+                    column: 15
+                  }
+                }
               },
               kind: "init"
             }
           ],
-          end: {line: 1, column: 17}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 17
+            }
+          }
         },
-        end: {line: 1, column: 17}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 17
+          }
+        }
       },
-      end: {line: 1, column: 17}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 17
+        }
+      }
     }
   ],
-  end: {line: 1, column: 17}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 17
+    }
+  }
 });
 
 test("x = { null: 42 }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ObjectExpression",
-          start: {line: 1, column: 4},
           properties: [
             {
               key: {
                 type: "Identifier",
-                start: {line: 1, column: 6},
                 name: "null",
-                end: {line: 1, column: 10}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 6
+                  },
+                  end: {
+                    line: 1,
+                    column: 10
+                  }
+                }
               },
               value: {
                 type: "Literal",
-                start: {line: 1, column: 12},
                 value: 42,
-                end: {line: 1, column: 14}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 12
+                  },
+                  end: {
+                    line: 1,
+                    column: 14
+                  }
+                }
               },
               kind: "init"
             }
           ],
-          end: {line: 1, column: 16}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 16
+            }
+          }
         },
-        end: {line: 1, column: 16}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 16
+          }
+        }
       },
-      end: {line: 1, column: 16}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 16
+        }
+      }
     }
   ],
-  end: {line: 1, column: 16}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 16
+    }
+  }
 });
 
 test("x = { \"answer\": 42 }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ObjectExpression",
-          start: {line: 1, column: 4},
           properties: [
             {
               key: {
                 type: "Literal",
-                start: {line: 1, column: 6},
                 value: "answer",
-                end: {line: 1, column: 14}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 6
+                  },
+                  end: {
+                    line: 1,
+                    column: 14
+                  }
+                }
               },
               value: {
                 type: "Literal",
-                start: {line: 1, column: 16},
                 value: 42,
-                end: {line: 1, column: 18}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 16
+                  },
+                  end: {
+                    line: 1,
+                    column: 18
+                  }
+                }
               },
               kind: "init"
             }
           ],
-          end: {line: 1, column: 20}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 20
+            }
+          }
         },
-        end: {line: 1, column: 20}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 20
+          }
+        }
       },
-      end: {line: 1, column: 20}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 20
+        }
+      }
     }
   ],
-  end: {line: 1, column: 20}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 20
+    }
+  }
 });
 
 test("x = { x: 1, x: 2 }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ObjectExpression",
-          start: {line: 1, column: 4},
           properties: [
             {
               key: {
                 type: "Identifier",
-                start: {line: 1, column: 6},
                 name: "x",
-                end: {line: 1, column: 7}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 6
+                  },
+                  end: {
+                    line: 1,
+                    column: 7
+                  }
+                }
               },
               value: {
                 type: "Literal",
-                start: {line: 1, column: 9},
                 value: 1,
-                end: {line: 1, column: 10}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 9
+                  },
+                  end: {
+                    line: 1,
+                    column: 10
+                  }
+                }
               },
               kind: "init"
             },
             {
               key: {
                 type: "Identifier",
-                start: {line: 1, column: 12},
                 name: "x",
-                end: {line: 1, column: 13}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 12
+                  },
+                  end: {
+                    line: 1,
+                    column: 13
+                  }
+                }
               },
               value: {
                 type: "Literal",
-                start: {line: 1, column: 15},
                 value: 2,
-                end: {line: 1, column: 16}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 15
+                  },
+                  end: {
+                    line: 1,
+                    column: 16
+                  }
+                }
               },
               kind: "init"
             }
           ],
-          end: {line: 1, column: 18}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 18
+            }
+          }
         },
-        end: {line: 1, column: 18}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 18
+          }
+        }
       },
-      end: {line: 1, column: 18}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 18
+        }
+      }
     }
   ],
-  end: {line: 1, column: 18}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 18
+    }
+  }
 });
 
 test("x = { get width() { return m_width } }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ObjectExpression",
-          start: {line: 1, column: 4},
           properties: [
             {
               key: {
                 type: "Identifier",
-                start: {line: 1, column: 10},
                 name: "width",
-                end: {line: 1, column: 15}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 10
+                  },
+                  end: {
+                    line: 1,
+                    column: 15
+                  }
+                }
               },
               kind: "get",
               value: {
                 type: "FunctionExpression",
-                start: {line: 1, column: 15},
                 id: null,
                 params: [],
                 body: {
                   type: "BlockStatement",
-                  start: {line: 1, column: 18},
                   body: [
                     {
                       type: "ReturnStatement",
-                      start: {line: 1, column: 20},
                       argument: {
                         type: "Identifier",
-                        start: {line: 1, column: 27},
                         name: "m_width",
-                        end: {line: 1, column: 34}
+                        loc: {
+                          start: {
+                            line: 1,
+                            column: 27
+                          },
+                          end: {
+                            line: 1,
+                            column: 34
+                          }
+                        }
                       },
-                      end: {line: 1, column: 34}
+                      loc: {
+                        start: {
+                          line: 1,
+                          column: 20
+                        },
+                        end: {
+                          line: 1,
+                          column: 34
+                        }
+                      }
                     }
                   ],
-                  end: {line: 1, column: 36}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 18
+                    },
+                    end: {
+                      line: 1,
+                      column: 36
+                    }
+                  }
                 },
-                end: {line: 1, column: 36}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 15
+                  },
+                  end: {
+                    line: 1,
+                    column: 36
+                  }
+                }
               }
             }
           ],
-          end: {line: 1, column: 38}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 38
+            }
+          }
         },
-        end: {line: 1, column: 38}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 38
+          }
+        }
       },
-      end: {line: 1, column: 38}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 38
+        }
+      }
     }
   ],
-  end: {line: 1, column: 38}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 38
+    }
+  }
 });
 
 test("x = { get undef() {} }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ObjectExpression",
-          start: {line: 1, column: 4},
           properties: [
             {
               key: {
                 type: "Identifier",
-                start: {line: 1, column: 10},
                 name: "undef",
-                end: {line: 1, column: 15}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 10
+                  },
+                  end: {
+                    line: 1,
+                    column: 15
+                  }
+                }
               },
               kind: "get",
               value: {
                 type: "FunctionExpression",
-                start: {line: 1, column: 15},
                 id: null,
                 params: [],
                 body: {
                   type: "BlockStatement",
-                  start: {line: 1, column: 18},
                   body: [],
-                  end: {line: 1, column: 20}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 18
+                    },
+                    end: {
+                      line: 1,
+                      column: 20
+                    }
+                  }
                 },
-                end: {line: 1, column: 20}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 15
+                  },
+                  end: {
+                    line: 1,
+                    column: 20
+                  }
+                }
               }
             }
           ],
-          end: {line: 1, column: 22}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 22
+            }
+          }
         },
-        end: {line: 1, column: 22}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 22
+          }
+        }
       },
-      end: {line: 1, column: 22}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 22
+        }
+      }
     }
   ],
-  end: {line: 1, column: 22}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 22
+    }
+  }
 });
 
 test("x = { get if() {} }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ObjectExpression",
-          start: {line: 1, column: 4},
           properties: [
             {
               key: {
                 type: "Identifier",
-                start: {line: 1, column: 10},
                 name: "if",
-                end: {line: 1, column: 12}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 10
+                  },
+                  end: {
+                    line: 1,
+                    column: 12
+                  }
+                }
               },
               kind: "get",
               value: {
                 type: "FunctionExpression",
-                start: {line: 1, column: 12},
                 id: null,
                 params: [],
                 body: {
                   type: "BlockStatement",
-                  start: {line: 1, column: 15},
                   body: [],
-                  end: {line: 1, column: 17}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 15
+                    },
+                    end: {
+                      line: 1,
+                      column: 17
+                    }
+                  }
                 },
-                end: {line: 1, column: 17}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 12
+                  },
+                  end: {
+                    line: 1,
+                    column: 17
+                  }
+                }
               }
             }
           ],
-          end: {line: 1, column: 19}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 19
+            }
+          }
         },
-        end: {line: 1, column: 19}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 19
+          }
+        }
       },
-      end: {line: 1, column: 19}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 19
+        }
+      }
     }
   ],
-  end: {line: 1, column: 19}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 19
+    }
+  }
 });
 
 test("x = { get true() {} }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ObjectExpression",
-          start: {line: 1, column: 4},
           properties: [
             {
               key: {
                 type: "Identifier",
-                start: {line: 1, column: 10},
                 name: "true",
-                end: {line: 1, column: 14}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 10
+                  },
+                  end: {
+                    line: 1,
+                    column: 14
+                  }
+                }
               },
               kind: "get",
               value: {
                 type: "FunctionExpression",
-                start: {line: 1, column: 14},
                 id: null,
                 params: [],
                 body: {
                   type: "BlockStatement",
-                  start: {line: 1, column: 17},
                   body: [],
-                  end: {line: 1, column: 19}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 17
+                    },
+                    end: {
+                      line: 1,
+                      column: 19
+                    }
+                  }
                 },
-                end: {line: 1, column: 19}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 14
+                  },
+                  end: {
+                    line: 1,
+                    column: 19
+                  }
+                }
               }
             }
           ],
-          end: {line: 1, column: 21}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 21
+            }
+          }
         },
-        end: {line: 1, column: 21}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 21
+          }
+        }
       },
-      end: {line: 1, column: 21}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 21
+        }
+      }
     }
   ],
-  end: {line: 1, column: 21}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 21
+    }
+  }
 });
 
 test("x = { get false() {} }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ObjectExpression",
-          start: {line: 1, column: 4},
           properties: [
             {
               key: {
                 type: "Identifier",
-                start: {line: 1, column: 10},
                 name: "false",
-                end: {line: 1, column: 15}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 10
+                  },
+                  end: {
+                    line: 1,
+                    column: 15
+                  }
+                }
               },
               kind: "get",
               value: {
                 type: "FunctionExpression",
-                start: {line: 1, column: 15},
                 id: null,
                 params: [],
                 body: {
                   type: "BlockStatement",
-                  start: {line: 1, column: 18},
                   body: [],
-                  end: {line: 1, column: 20}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 18
+                    },
+                    end: {
+                      line: 1,
+                      column: 20
+                    }
+                  }
                 },
-                end: {line: 1, column: 20}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 15
+                  },
+                  end: {
+                    line: 1,
+                    column: 20
+                  }
+                }
               }
             }
           ],
-          end: {line: 1, column: 22}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 22
+            }
+          }
         },
-        end: {line: 1, column: 22}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 22
+          }
+        }
       },
-      end: {line: 1, column: 22}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 22
+        }
+      }
     }
   ],
-  end: {line: 1, column: 22}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 22
+    }
+  }
 });
 
 test("x = { get null() {} }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ObjectExpression",
-          start: {line: 1, column: 4},
           properties: [
             {
               key: {
                 type: "Identifier",
-                start: {line: 1, column: 10},
                 name: "null",
-                end: {line: 1, column: 14}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 10
+                  },
+                  end: {
+                    line: 1,
+                    column: 14
+                  }
+                }
               },
               kind: "get",
               value: {
                 type: "FunctionExpression",
-                start: {line: 1, column: 14},
                 id: null,
                 params: [],
                 body: {
                   type: "BlockStatement",
-                  start: {line: 1, column: 17},
                   body: [],
-                  end: {line: 1, column: 19}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 17
+                    },
+                    end: {
+                      line: 1,
+                      column: 19
+                    }
+                  }
                 },
-                end: {line: 1, column: 19}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 14
+                  },
+                  end: {
+                    line: 1,
+                    column: 19
+                  }
+                }
               }
             }
           ],
-          end: {line: 1, column: 21}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 21
+            }
+          }
         },
-        end: {line: 1, column: 21}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 21
+          }
+        }
       },
-      end: {line: 1, column: 21}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 21
+        }
+      }
     }
   ],
-  end: {line: 1, column: 21}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 21
+    }
+  }
 });
 
 test("x = { get \"undef\"() {} }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ObjectExpression",
-          start: {line: 1, column: 4},
           properties: [
             {
               key: {
                 type: "Literal",
-                start: {line: 1, column: 10},
                 value: "undef",
-                end: {line: 1, column: 17}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 10
+                  },
+                  end: {
+                    line: 1,
+                    column: 17
+                  }
+                }
               },
               kind: "get",
               value: {
                 type: "FunctionExpression",
-                start: {line: 1, column: 17},
                 id: null,
                 params: [],
                 body: {
                   type: "BlockStatement",
-                  start: {line: 1, column: 20},
                   body: [],
-                  end: {line: 1, column: 22}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 20
+                    },
+                    end: {
+                      line: 1,
+                      column: 22
+                    }
+                  }
                 },
-                end: {line: 1, column: 22}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 17
+                  },
+                  end: {
+                    line: 1,
+                    column: 22
+                  }
+                }
               }
             }
           ],
-          end: {line: 1, column: 24}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 24
+            }
+          }
         },
-        end: {line: 1, column: 24}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 24
+          }
+        }
       },
-      end: {line: 1, column: 24}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 24
+        }
+      }
     }
   ],
-  end: {line: 1, column: 24}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 24
+    }
+  }
 });
 
 test("x = { get 10() {} }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ObjectExpression",
-          start: {line: 1, column: 4},
           properties: [
             {
               key: {
                 type: "Literal",
-                start: {line: 1, column: 10},
                 value: 10,
-                end: {line: 1, column: 12}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 10
+                  },
+                  end: {
+                    line: 1,
+                    column: 12
+                  }
+                }
               },
               kind: "get",
               value: {
                 type: "FunctionExpression",
-                start: {line: 1, column: 12},
                 id: null,
                 params: [],
                 body: {
                   type: "BlockStatement",
-                  start: {line: 1, column: 15},
                   body: [],
-                  end: {line: 1, column: 17}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 15
+                    },
+                    end: {
+                      line: 1,
+                      column: 17
+                    }
+                  }
                 },
-                end: {line: 1, column: 17}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 12
+                  },
+                  end: {
+                    line: 1,
+                    column: 17
+                  }
+                }
               }
             }
           ],
-          end: {line: 1, column: 19}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 19
+            }
+          }
         },
-        end: {line: 1, column: 19}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 19
+          }
+        }
       },
-      end: {line: 1, column: 19}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 19
+        }
+      }
     }
   ],
-  end: {line: 1, column: 19}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 19
+    }
+  }
 });
 
 test("x = { set width(w) { m_width = w } }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ObjectExpression",
-          start: {line: 1, column: 4},
           properties: [
             {
               key: {
                 type: "Identifier",
-                start: {line: 1, column: 10},
                 name: "width",
-                end: {line: 1, column: 15}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 10
+                  },
+                  end: {
+                    line: 1,
+                    column: 15
+                  }
+                }
               },
               kind: "set",
               value: {
                 type: "FunctionExpression",
-                start: {line: 1, column: 15},
                 id: null,
                 params: [
                   {
                     type: "Identifier",
-                    start: {line: 1, column: 16},
                     name: "w",
-                    end: {line: 1, column: 17}
+                    loc: {
+                      start: {
+                        line: 1,
+                        column: 16
+                      },
+                      end: {
+                        line: 1,
+                        column: 17
+                      }
+                    }
                   }
                 ],
                 body: {
                   type: "BlockStatement",
-                  start: {line: 1, column: 19},
                   body: [
                     {
                       type: "ExpressionStatement",
-                      start: {line: 1, column: 21},
                       expression: {
                         type: "AssignmentExpression",
-                        start: {line: 1, column: 21},
                         operator: "=",
                         left: {
                           type: "Identifier",
-                          start: {line: 1, column: 21},
                           name: "m_width",
-                          end: {line: 1, column: 28}
+                          loc: {
+                            start: {
+                              line: 1,
+                              column: 21
+                            },
+                            end: {
+                              line: 1,
+                              column: 28
+                            }
+                          }
                         },
                         right: {
                           type: "Identifier",
-                          start: {line: 1, column: 31},
                           name: "w",
-                          end: {line: 1, column: 32}
+                          loc: {
+                            start: {
+                              line: 1,
+                              column: 31
+                            },
+                            end: {
+                              line: 1,
+                              column: 32
+                            }
+                          }
                         },
-                        end: {line: 1, column: 32}
+                        loc: {
+                          start: {
+                            line: 1,
+                            column: 21
+                          },
+                          end: {
+                            line: 1,
+                            column: 32
+                          }
+                        }
                       },
-                      end: {line: 1, column: 32}
+                      loc: {
+                        start: {
+                          line: 1,
+                          column: 21
+                        },
+                        end: {
+                          line: 1,
+                          column: 32
+                        }
+                      }
                     }
                   ],
-                  end: {line: 1, column: 34}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 19
+                    },
+                    end: {
+                      line: 1,
+                      column: 34
+                    }
+                  }
                 },
-                end: {line: 1, column: 34}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 15
+                  },
+                  end: {
+                    line: 1,
+                    column: 34
+                  }
+                }
               }
             }
           ],
-          end: {line: 1, column: 36}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 36
+            }
+          }
         },
-        end: {line: 1, column: 36}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 36
+          }
+        }
       },
-      end: {line: 1, column: 36}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 36
+        }
+      }
     }
   ],
-  end: {line: 1, column: 36}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 36
+    }
+  }
 });
 
 test("x = { set if(w) { m_if = w } }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ObjectExpression",
-          start: {line: 1, column: 4},
           properties: [
             {
               key: {
                 type: "Identifier",
-                start: {line: 1, column: 10},
                 name: "if",
-                end: {line: 1, column: 12}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 10
+                  },
+                  end: {
+                    line: 1,
+                    column: 12
+                  }
+                }
               },
               kind: "set",
               value: {
                 type: "FunctionExpression",
-                start: {line: 1, column: 12},
                 id: null,
                 params: [
                   {
                     type: "Identifier",
-                    start: {line: 1, column: 13},
                     name: "w",
-                    end: {line: 1, column: 14}
+                    loc: {
+                      start: {
+                        line: 1,
+                        column: 13
+                      },
+                      end: {
+                        line: 1,
+                        column: 14
+                      }
+                    }
                   }
                 ],
                 body: {
                   type: "BlockStatement",
-                  start: {line: 1, column: 16},
                   body: [
                     {
                       type: "ExpressionStatement",
-                      start: {line: 1, column: 18},
                       expression: {
                         type: "AssignmentExpression",
-                        start: {line: 1, column: 18},
                         operator: "=",
                         left: {
                           type: "Identifier",
-                          start: {line: 1, column: 18},
                           name: "m_if",
-                          end: {line: 1, column: 22}
+                          loc: {
+                            start: {
+                              line: 1,
+                              column: 18
+                            },
+                            end: {
+                              line: 1,
+                              column: 22
+                            }
+                          }
                         },
                         right: {
                           type: "Identifier",
-                          start: {line: 1, column: 25},
                           name: "w",
-                          end: {line: 1, column: 26}
+                          loc: {
+                            start: {
+                              line: 1,
+                              column: 25
+                            },
+                            end: {
+                              line: 1,
+                              column: 26
+                            }
+                          }
                         },
-                        end: {line: 1, column: 26}
+                        loc: {
+                          start: {
+                            line: 1,
+                            column: 18
+                          },
+                          end: {
+                            line: 1,
+                            column: 26
+                          }
+                        }
                       },
-                      end: {line: 1, column: 26}
+                      loc: {
+                        start: {
+                          line: 1,
+                          column: 18
+                        },
+                        end: {
+                          line: 1,
+                          column: 26
+                        }
+                      }
                     }
                   ],
-                  end: {line: 1, column: 28}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 16
+                    },
+                    end: {
+                      line: 1,
+                      column: 28
+                    }
+                  }
                 },
-                end: {line: 1, column: 28}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 12
+                  },
+                  end: {
+                    line: 1,
+                    column: 28
+                  }
+                }
               }
             }
           ],
-          end: {line: 1, column: 30}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 30
+            }
+          }
         },
-        end: {line: 1, column: 30}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 30
+          }
+        }
       },
-      end: {line: 1, column: 30}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 30
+        }
+      }
     }
   ],
-  end: {line: 1, column: 30}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 30
+    }
+  }
 });
 
 test("x = { set true(w) { m_true = w } }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ObjectExpression",
-          start: {line: 1, column: 4},
           properties: [
             {
               key: {
                 type: "Identifier",
-                start: {line: 1, column: 10},
                 name: "true",
-                end: {line: 1, column: 14}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 10
+                  },
+                  end: {
+                    line: 1,
+                    column: 14
+                  }
+                }
               },
               kind: "set",
               value: {
                 type: "FunctionExpression",
-                start: {line: 1, column: 14},
                 id: null,
                 params: [
                   {
                     type: "Identifier",
-                    start: {line: 1, column: 15},
                     name: "w",
-                    end: {line: 1, column: 16}
+                    loc: {
+                      start: {
+                        line: 1,
+                        column: 15
+                      },
+                      end: {
+                        line: 1,
+                        column: 16
+                      }
+                    }
                   }
                 ],
                 body: {
                   type: "BlockStatement",
-                  start: {line: 1, column: 18},
                   body: [
                     {
                       type: "ExpressionStatement",
-                      start: {line: 1, column: 20},
                       expression: {
                         type: "AssignmentExpression",
-                        start: {line: 1, column: 20},
                         operator: "=",
                         left: {
                           type: "Identifier",
-                          start: {line: 1, column: 20},
                           name: "m_true",
-                          end: {line: 1, column: 26}
+                          loc: {
+                            start: {
+                              line: 1,
+                              column: 20
+                            },
+                            end: {
+                              line: 1,
+                              column: 26
+                            }
+                          }
                         },
                         right: {
                           type: "Identifier",
-                          start: {line: 1, column: 29},
                           name: "w",
-                          end: {line: 1, column: 30}
+                          loc: {
+                            start: {
+                              line: 1,
+                              column: 29
+                            },
+                            end: {
+                              line: 1,
+                              column: 30
+                            }
+                          }
                         },
-                        end: {line: 1, column: 30}
+                        loc: {
+                          start: {
+                            line: 1,
+                            column: 20
+                          },
+                          end: {
+                            line: 1,
+                            column: 30
+                          }
+                        }
                       },
-                      end: {line: 1, column: 30}
+                      loc: {
+                        start: {
+                          line: 1,
+                          column: 20
+                        },
+                        end: {
+                          line: 1,
+                          column: 30
+                        }
+                      }
                     }
                   ],
-                  end: {line: 1, column: 32}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 18
+                    },
+                    end: {
+                      line: 1,
+                      column: 32
+                    }
+                  }
                 },
-                end: {line: 1, column: 32}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 14
+                  },
+                  end: {
+                    line: 1,
+                    column: 32
+                  }
+                }
               }
             }
           ],
-          end: {line: 1, column: 34}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 34
+            }
+          }
         },
-        end: {line: 1, column: 34}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 34
+          }
+        }
       },
-      end: {line: 1, column: 34}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 34
+        }
+      }
     }
   ],
-  end: {line: 1, column: 34}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 34
+    }
+  }
 });
 
 test("x = { set false(w) { m_false = w } }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ObjectExpression",
-          start: {line: 1, column: 4},
           properties: [
             {
               key: {
                 type: "Identifier",
-                start: {line: 1, column: 10},
                 name: "false",
-                end: {line: 1, column: 15}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 10
+                  },
+                  end: {
+                    line: 1,
+                    column: 15
+                  }
+                }
               },
               kind: "set",
               value: {
                 type: "FunctionExpression",
-                start: {line: 1, column: 15},
                 id: null,
                 params: [
                   {
                     type: "Identifier",
-                    start: {line: 1, column: 16},
                     name: "w",
-                    end: {line: 1, column: 17}
+                    loc: {
+                      start: {
+                        line: 1,
+                        column: 16
+                      },
+                      end: {
+                        line: 1,
+                        column: 17
+                      }
+                    }
                   }
                 ],
                 body: {
                   type: "BlockStatement",
-                  start: {line: 1, column: 19},
                   body: [
                     {
                       type: "ExpressionStatement",
-                      start: {line: 1, column: 21},
                       expression: {
                         type: "AssignmentExpression",
-                        start: {line: 1, column: 21},
                         operator: "=",
                         left: {
                           type: "Identifier",
-                          start: {line: 1, column: 21},
                           name: "m_false",
-                          end: {line: 1, column: 28}
+                          loc: {
+                            start: {
+                              line: 1,
+                              column: 21
+                            },
+                            end: {
+                              line: 1,
+                              column: 28
+                            }
+                          }
                         },
                         right: {
                           type: "Identifier",
-                          start: {line: 1, column: 31},
                           name: "w",
-                          end: {line: 1, column: 32}
+                          loc: {
+                            start: {
+                              line: 1,
+                              column: 31
+                            },
+                            end: {
+                              line: 1,
+                              column: 32
+                            }
+                          }
                         },
-                        end: {line: 1, column: 32}
+                        loc: {
+                          start: {
+                            line: 1,
+                            column: 21
+                          },
+                          end: {
+                            line: 1,
+                            column: 32
+                          }
+                        }
                       },
-                      end: {line: 1, column: 32}
+                      loc: {
+                        start: {
+                          line: 1,
+                          column: 21
+                        },
+                        end: {
+                          line: 1,
+                          column: 32
+                        }
+                      }
                     }
                   ],
-                  end: {line: 1, column: 34}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 19
+                    },
+                    end: {
+                      line: 1,
+                      column: 34
+                    }
+                  }
                 },
-                end: {line: 1, column: 34}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 15
+                  },
+                  end: {
+                    line: 1,
+                    column: 34
+                  }
+                }
               }
             }
           ],
-          end: {line: 1, column: 36}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 36
+            }
+          }
         },
-        end: {line: 1, column: 36}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 36
+          }
+        }
       },
-      end: {line: 1, column: 36}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 36
+        }
+      }
     }
   ],
-  end: {line: 1, column: 36}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 36
+    }
+  }
 });
 
 test("x = { set null(w) { m_null = w } }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ObjectExpression",
-          start: {line: 1, column: 4},
           properties: [
             {
               key: {
                 type: "Identifier",
-                start: {line: 1, column: 10},
                 name: "null",
-                end: {line: 1, column: 14}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 10
+                  },
+                  end: {
+                    line: 1,
+                    column: 14
+                  }
+                }
               },
               kind: "set",
               value: {
                 type: "FunctionExpression",
-                start: {line: 1, column: 14},
                 id: null,
                 params: [
                   {
                     type: "Identifier",
-                    start: {line: 1, column: 15},
                     name: "w",
-                    end: {line: 1, column: 16}
+                    loc: {
+                      start: {
+                        line: 1,
+                        column: 15
+                      },
+                      end: {
+                        line: 1,
+                        column: 16
+                      }
+                    }
                   }
                 ],
                 body: {
                   type: "BlockStatement",
-                  start: {line: 1, column: 18},
                   body: [
                     {
                       type: "ExpressionStatement",
-                      start: {line: 1, column: 20},
                       expression: {
                         type: "AssignmentExpression",
-                        start: {line: 1, column: 20},
                         operator: "=",
                         left: {
                           type: "Identifier",
-                          start: {line: 1, column: 20},
                           name: "m_null",
-                          end: {line: 1, column: 26}
+                          loc: {
+                            start: {
+                              line: 1,
+                              column: 20
+                            },
+                            end: {
+                              line: 1,
+                              column: 26
+                            }
+                          }
                         },
                         right: {
                           type: "Identifier",
-                          start: {line: 1, column: 29},
                           name: "w",
-                          end: {line: 1, column: 30}
+                          loc: {
+                            start: {
+                              line: 1,
+                              column: 29
+                            },
+                            end: {
+                              line: 1,
+                              column: 30
+                            }
+                          }
                         },
-                        end: {line: 1, column: 30}
+                        loc: {
+                          start: {
+                            line: 1,
+                            column: 20
+                          },
+                          end: {
+                            line: 1,
+                            column: 30
+                          }
+                        }
                       },
-                      end: {line: 1, column: 30}
+                      loc: {
+                        start: {
+                          line: 1,
+                          column: 20
+                        },
+                        end: {
+                          line: 1,
+                          column: 30
+                        }
+                      }
                     }
                   ],
-                  end: {line: 1, column: 32}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 18
+                    },
+                    end: {
+                      line: 1,
+                      column: 32
+                    }
+                  }
                 },
-                end: {line: 1, column: 32}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 14
+                  },
+                  end: {
+                    line: 1,
+                    column: 32
+                  }
+                }
               }
             }
           ],
-          end: {line: 1, column: 34}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 34
+            }
+          }
         },
-        end: {line: 1, column: 34}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 34
+          }
+        }
       },
-      end: {line: 1, column: 34}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 34
+        }
+      }
     }
   ],
-  end: {line: 1, column: 34}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 34
+    }
+  }
 });
 
 test("x = { set \"null\"(w) { m_null = w } }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ObjectExpression",
-          start: {line: 1, column: 4},
           properties: [
             {
               key: {
                 type: "Literal",
-                start: {line: 1, column: 10},
                 value: "null",
-                end: {line: 1, column: 16}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 10
+                  },
+                  end: {
+                    line: 1,
+                    column: 16
+                  }
+                }
               },
               kind: "set",
               value: {
                 type: "FunctionExpression",
-                start: {line: 1, column: 16},
                 id: null,
                 params: [
                   {
                     type: "Identifier",
-                    start: {line: 1, column: 17},
                     name: "w",
-                    end: {line: 1, column: 18}
+                    loc: {
+                      start: {
+                        line: 1,
+                        column: 17
+                      },
+                      end: {
+                        line: 1,
+                        column: 18
+                      }
+                    }
                   }
                 ],
                 body: {
                   type: "BlockStatement",
-                  start: {line: 1, column: 20},
                   body: [
                     {
                       type: "ExpressionStatement",
-                      start: {line: 1, column: 22},
                       expression: {
                         type: "AssignmentExpression",
-                        start: {line: 1, column: 22},
                         operator: "=",
                         left: {
                           type: "Identifier",
-                          start: {line: 1, column: 22},
                           name: "m_null",
-                          end: {line: 1, column: 28}
+                          loc: {
+                            start: {
+                              line: 1,
+                              column: 22
+                            },
+                            end: {
+                              line: 1,
+                              column: 28
+                            }
+                          }
                         },
                         right: {
                           type: "Identifier",
-                          start: {line: 1, column: 31},
                           name: "w",
-                          end: {line: 1, column: 32}
+                          loc: {
+                            start: {
+                              line: 1,
+                              column: 31
+                            },
+                            end: {
+                              line: 1,
+                              column: 32
+                            }
+                          }
                         },
-                        end: {line: 1, column: 32}
+                        loc: {
+                          start: {
+                            line: 1,
+                            column: 22
+                          },
+                          end: {
+                            line: 1,
+                            column: 32
+                          }
+                        }
                       },
-                      end: {line: 1, column: 32}
+                      loc: {
+                        start: {
+                          line: 1,
+                          column: 22
+                        },
+                        end: {
+                          line: 1,
+                          column: 32
+                        }
+                      }
                     }
                   ],
-                  end: {line: 1, column: 34}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 20
+                    },
+                    end: {
+                      line: 1,
+                      column: 34
+                    }
+                  }
                 },
-                end: {line: 1, column: 34}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 16
+                  },
+                  end: {
+                    line: 1,
+                    column: 34
+                  }
+                }
               }
             }
           ],
-          end: {line: 1, column: 36}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 36
+            }
+          }
         },
-        end: {line: 1, column: 36}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 36
+          }
+        }
       },
-      end: {line: 1, column: 36}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 36
+        }
+      }
     }
   ],
-  end: {line: 1, column: 36}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 36
+    }
+  }
 });
 
 test("x = { set 10(w) { m_null = w } }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ObjectExpression",
-          start: {line: 1, column: 4},
           properties: [
             {
               key: {
                 type: "Literal",
-                start: {line: 1, column: 10},
                 value: 10,
-                end: {line: 1, column: 12}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 10
+                  },
+                  end: {
+                    line: 1,
+                    column: 12
+                  }
+                }
               },
               kind: "set",
               value: {
                 type: "FunctionExpression",
-                start: {line: 1, column: 12},
                 id: null,
                 params: [
                   {
                     type: "Identifier",
-                    start: {line: 1, column: 13},
                     name: "w",
-                    end: {line: 1, column: 14}
+                    loc: {
+                      start: {
+                        line: 1,
+                        column: 13
+                      },
+                      end: {
+                        line: 1,
+                        column: 14
+                      }
+                    }
                   }
                 ],
                 body: {
                   type: "BlockStatement",
-                  start: {line: 1, column: 16},
                   body: [
                     {
                       type: "ExpressionStatement",
-                      start: {line: 1, column: 18},
                       expression: {
                         type: "AssignmentExpression",
-                        start: {line: 1, column: 18},
                         operator: "=",
                         left: {
                           type: "Identifier",
-                          start: {line: 1, column: 18},
                           name: "m_null",
-                          end: {line: 1, column: 24}
+                          loc: {
+                            start: {
+                              line: 1,
+                              column: 18
+                            },
+                            end: {
+                              line: 1,
+                              column: 24
+                            }
+                          }
                         },
                         right: {
                           type: "Identifier",
-                          start: {line: 1, column: 27},
                           name: "w",
-                          end: {line: 1, column: 28}
+                          loc: {
+                            start: {
+                              line: 1,
+                              column: 27
+                            },
+                            end: {
+                              line: 1,
+                              column: 28
+                            }
+                          }
                         },
-                        end: {line: 1, column: 28}
+                        loc: {
+                          start: {
+                            line: 1,
+                            column: 18
+                          },
+                          end: {
+                            line: 1,
+                            column: 28
+                          }
+                        }
                       },
-                      end: {line: 1, column: 28}
+                      loc: {
+                        start: {
+                          line: 1,
+                          column: 18
+                        },
+                        end: {
+                          line: 1,
+                          column: 28
+                        }
+                      }
                     }
                   ],
-                  end: {line: 1, column: 30}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 16
+                    },
+                    end: {
+                      line: 1,
+                      column: 30
+                    }
+                  }
                 },
-                end: {line: 1, column: 30}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 12
+                  },
+                  end: {
+                    line: 1,
+                    column: 30
+                  }
+                }
               }
             }
           ],
-          end: {line: 1, column: 32}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 32
+            }
+          }
         },
-        end: {line: 1, column: 32}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 32
+          }
+        }
       },
-      end: {line: 1, column: 32}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 32
+        }
+      }
     }
   ],
-  end: {line: 1, column: 32}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 32
+    }
+  }
 });
 
 test("x = { get: 42 }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ObjectExpression",
-          start: {line: 1, column: 4},
           properties: [
             {
               key: {
                 type: "Identifier",
-                start: {line: 1, column: 6},
                 name: "get",
-                end: {line: 1, column: 9}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 6
+                  },
+                  end: {
+                    line: 1,
+                    column: 9
+                  }
+                }
               },
               value: {
                 type: "Literal",
-                start: {line: 1, column: 11},
                 value: 42,
-                end: {line: 1, column: 13}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 11
+                  },
+                  end: {
+                    line: 1,
+                    column: 13
+                  }
+                }
               },
               kind: "init"
             }
           ],
-          end: {line: 1, column: 15}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 15
+            }
+          }
         },
-        end: {line: 1, column: 15}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 15
+          }
+        }
       },
-      end: {line: 1, column: 15}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 15
+        }
+      }
     }
   ],
-  end: {line: 1, column: 15}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 15
+    }
+  }
 });
 
 test("x = { set: 43 }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "ObjectExpression",
-          start: {line: 1, column: 4},
           properties: [
             {
               key: {
                 type: "Identifier",
-                start: {line: 1, column: 6},
                 name: "set",
-                end: {line: 1, column: 9}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 6
+                  },
+                  end: {
+                    line: 1,
+                    column: 9
+                  }
+                }
               },
               value: {
                 type: "Literal",
-                start: {line: 1, column: 11},
                 value: 43,
-                end: {line: 1, column: 13}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 11
+                  },
+                  end: {
+                    line: 1,
+                    column: 13
+                  }
+                }
               },
               kind: "init"
             }
           ],
-          end: {line: 1, column: 15}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 15
+            }
+          }
         },
-        end: {line: 1, column: 15}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 15
+          }
+        }
       },
-      end: {line: 1, column: 15}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 15
+        }
+      }
     }
   ],
-  end: {line: 1, column: 15}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 15
+    }
+  }
 });
 
 test("/* block comment */ 42", {
   type: "Program",
-  start: {line: 1, column: 20},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 20},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 20},
         value: 42,
-        end: {line: 1, column: 22}
+        loc: {
+          start: {
+            line: 1,
+            column: 20
+          },
+          end: {
+            line: 1,
+            column: 22
+          }
+        }
       },
-      end: {line: 1, column: 22}
+      loc: {
+        start: {
+          line: 1,
+          column: 20
+        },
+        end: {
+          line: 1,
+          column: 22
+        }
+      }
     }
   ],
-  end: {line: 1, column: 22}
+  loc: {
+    start: {
+      line: 1,
+      column: 20
+    },
+    end: {
+      line: 1,
+      column: 22
+    }
+  }
 });
 
 test("42 /*The*/ /*Answer*/", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: 42,
-        end: {line: 1, column: 2}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 2
+          }
+        }
       },
-      end: {line: 1, column: 2}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 2
+        }
+      }
     }
   ],
-  end: {line: 1, column: 2}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 2
+    }
+  }
 });
 
 test("42 /*the*/ /*answer*/", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: 42,
-        end: {line: 1, column: 2}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 2
+          }
+        }
       },
-      end: {line: 1, column: 2}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 2
+        }
+      }
     }
   ],
-  end: {line: 1, column: 2}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 2
+    }
+  }
 });
 
 test("/* multiline\ncomment\nshould\nbe\nignored */ 42", {
   type: "Program",
-  start: {line: 5, column: 11},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 5, column: 11},
       expression: {
         type: "Literal",
-        start: {line: 5, column: 11},
         value: 42,
-        end: {line: 5, column: 13}
+        loc: {
+          start: {
+            line: 5,
+            column: 11
+          },
+          end: {
+            line: 5,
+            column: 13
+          }
+        }
       },
-      end: {line: 5, column: 13}
+      loc: {
+        start: {
+          line: 5,
+          column: 11
+        },
+        end: {
+          line: 5,
+          column: 13
+        }
+      }
     }
   ],
-  end: {line: 5, column: 13}
+  loc: {
+    start: {
+      line: 5,
+      column: 11
+    },
+    end: {
+      line: 5,
+      column: 13
+    }
+  }
 });
 
 test("/*a\r\nb*/ 42", {
   type: "Program",
-  start: {line: 2, column: 4},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 2, column: 4},
       expression: {
         type: "Literal",
-        start: {line: 2, column: 4},
         value: 42,
-        end: {line: 2, column: 6}
+        loc: {
+          start: {
+            line: 2,
+            column: 4
+          },
+          end: {
+            line: 2,
+            column: 6
+          }
+        }
       },
-      end: {line: 2, column: 6}
+      loc: {
+        start: {
+          line: 2,
+          column: 4
+        },
+        end: {
+          line: 2,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 2, column: 6}
+  loc: {
+    start: {
+      line: 2,
+      column: 4
+    },
+    end: {
+      line: 2,
+      column: 6
+    }
+  }
 });
 
 test("/*a\rb*/ 42", {
   type: "Program",
-  start: {line: 2, column: 4},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 2, column: 4},
       expression: {
         type: "Literal",
-        start: {line: 2, column: 4},
         value: 42,
-        end: {line: 2, column: 6}
+        loc: {
+          start: {
+            line: 2,
+            column: 4
+          },
+          end: {
+            line: 2,
+            column: 6
+          }
+        }
       },
-      end: {line: 2, column: 6}
+      loc: {
+        start: {
+          line: 2,
+          column: 4
+        },
+        end: {
+          line: 2,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 2, column: 6}
+  loc: {
+    start: {
+      line: 2,
+      column: 4
+    },
+    end: {
+      line: 2,
+      column: 6
+    }
+  }
 });
 
 test("/*a\nb*/ 42", {
   type: "Program",
-  start: {line: 2, column: 4},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 2, column: 4},
       expression: {
         type: "Literal",
-        start: {line: 2, column: 4},
         value: 42,
-        end: {line: 2, column: 6}
+        loc: {
+          start: {
+            line: 2,
+            column: 4
+          },
+          end: {
+            line: 2,
+            column: 6
+          }
+        }
       },
-      end: {line: 2, column: 6}
+      loc: {
+        start: {
+          line: 2,
+          column: 4
+        },
+        end: {
+          line: 2,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 2, column: 6}
+  loc: {
+    start: {
+      line: 2,
+      column: 4
+    },
+    end: {
+      line: 2,
+      column: 6
+    }
+  }
 });
 
 test("/*a\nc*/ 42", {
   type: "Program",
-  start: {line: 2, column: 4},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 2, column: 4},
       expression: {
         type: "Literal",
-        start: {line: 2, column: 4},
         value: 42,
-        end: {line: 2, column: 6}
+        loc: {
+          start: {
+            line: 2,
+            column: 4
+          },
+          end: {
+            line: 2,
+            column: 6
+          }
+        }
       },
-      end: {line: 2, column: 6}
+      loc: {
+        start: {
+          line: 2,
+          column: 4
+        },
+        end: {
+          line: 2,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 2, column: 6}
+  loc: {
+    start: {
+      line: 2,
+      column: 4
+    },
+    end: {
+      line: 2,
+      column: 6
+    }
+  }
 });
 
 test("// line comment\n42", {
   type: "Program",
-  start: {line: 2, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 2, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 2, column: 0},
         value: 42,
-        end: {line: 2, column: 2}
+        loc: {
+          start: {
+            line: 2,
+            column: 0
+          },
+          end: {
+            line: 2,
+            column: 2
+          }
+        }
       },
-      end: {line: 2, column: 2}
+      loc: {
+        start: {
+          line: 2,
+          column: 0
+        },
+        end: {
+          line: 2,
+          column: 2
+        }
+      }
     }
   ],
-  end: {line: 2, column: 2}
+  loc: {
+    start: {
+      line: 2,
+      column: 0
+    },
+    end: {
+      line: 2,
+      column: 2
+    }
+  }
 });
 
 test("42 // line comment", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: 42,
-        end: {line: 1, column: 2}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 2
+          }
+        }
       },
-      end: {line: 1, column: 2}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 2
+        }
+      }
     }
   ],
-  end: {line: 1, column: 2}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 2
+    }
+  }
 });
 
 test("// Hello, world!\n42", {
   type: "Program",
-  start: {line: 2, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 2, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 2, column: 0},
         value: 42,
-        end: {line: 2, column: 2}
+        loc: {
+          start: {
+            line: 2,
+            column: 0
+          },
+          end: {
+            line: 2,
+            column: 2
+          }
+        }
       },
-      end: {line: 2, column: 2}
+      loc: {
+        start: {
+          line: 2,
+          column: 0
+        },
+        end: {
+          line: 2,
+          column: 2
+        }
+      }
     }
   ],
-  end: {line: 2, column: 2}
+  loc: {
+    start: {
+      line: 2,
+      column: 0
+    },
+    end: {
+      line: 2,
+      column: 2
+    }
+  }
 });
 
 test("// Hello, world!\n", {
   type: "Program",
-  start: {line: 2, column: 0},
   body: [],
-  end: {line: 2, column: 0}
+  loc: {
+    start: {
+      line: 2,
+      column: 0
+    },
+    end: {
+      line: 2,
+      column: 0
+    }
+  }
 });
 
 test("// Hallo, world!\n", {
   type: "Program",
-  start: {line: 2, column: 0},
   body: [],
-  end: {line: 2, column: 0}
+  loc: {
+    start: {
+      line: 2,
+      column: 0
+    },
+    end: {
+      line: 2,
+      column: 0
+    }
+  }
 });
 
 test("//\n42", {
   type: "Program",
-  start: {line: 2, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 2, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 2, column: 0},
         value: 42,
-        end: {line: 2, column: 2}
+        loc: {
+          start: {
+            line: 2,
+            column: 0
+          },
+          end: {
+            line: 2,
+            column: 2
+          }
+        }
       },
-      end: {line: 2, column: 2}
+      loc: {
+        start: {
+          line: 2,
+          column: 0
+        },
+        end: {
+          line: 2,
+          column: 2
+        }
+      }
     }
   ],
-  end: {line: 2, column: 2}
+  loc: {
+    start: {
+      line: 2,
+      column: 0
+    },
+    end: {
+      line: 2,
+      column: 2
+    }
+  }
 });
 
 test("//", {
   type: "Program",
-  start: {line: 1, column: 2},
   body: [],
-  end: {line: 1, column: 2}
+  loc: {
+    start: {
+      line: 1,
+      column: 2
+    },
+    end: {
+      line: 1,
+      column: 2
+    }
+  }
 });
 
 test("// ", {
   type: "Program",
-  start: {line: 1, column: 3},
   body: [],
-  end: {line: 1, column: 3}
+  loc: {
+    start: {
+      line: 1,
+      column: 3
+    },
+    end: {
+      line: 1,
+      column: 3
+    }
+  }
 });
 
 test("/**/42", {
   type: "Program",
-  start: {line: 1, column: 4},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 4},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 4},
         value: 42,
-        end: {line: 1, column: 6}
+        loc: {
+          start: {
+            line: 1,
+            column: 4
+          },
+          end: {
+            line: 1,
+            column: 6
+          }
+        }
       },
-      end: {line: 1, column: 6}
+      loc: {
+        start: {
+          line: 1,
+          column: 4
+        },
+        end: {
+          line: 1,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 1, column: 6}
+  loc: {
+    start: {
+      line: 1,
+      column: 4
+    },
+    end: {
+      line: 1,
+      column: 6
+    }
+  }
 });
 
 test("// Hello, world!\n\n//   Another hello\n42", {
   type: "Program",
-  start: {line: 4, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 4, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 4, column: 0},
         value: 42,
-        end: {line: 4, column: 2}
+        loc: {
+          start: {
+            line: 4,
+            column: 0
+          },
+          end: {
+            line: 4,
+            column: 2
+          }
+        }
       },
-      end: {line: 4, column: 2}
+      loc: {
+        start: {
+          line: 4,
+          column: 0
+        },
+        end: {
+          line: 4,
+          column: 2
+        }
+      }
     }
   ],
-  end: {line: 4, column: 2}
+  loc: {
+    start: {
+      line: 4,
+      column: 0
+    },
+    end: {
+      line: 4,
+      column: 2
+    }
+  }
 });
 
 test("if (x) { // Some comment\ndoThat(); }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "IfStatement",
-      start: {line: 1, column: 0},
       test: {
         type: "Identifier",
-        start: {line: 1, column: 4},
         name: "x",
-        end: {line: 1, column: 5}
+        loc: {
+          start: {
+            line: 1,
+            column: 4
+          },
+          end: {
+            line: 1,
+            column: 5
+          }
+        }
       },
       consequent: {
         type: "BlockStatement",
-        start: {line: 1, column: 7},
         body: [
           {
             type: "ExpressionStatement",
-            start: {line: 2, column: 0},
             expression: {
               type: "CallExpression",
-              start: {line: 2, column: 0},
               callee: {
                 type: "Identifier",
-                start: {line: 2, column: 0},
                 name: "doThat",
-                end: {line: 2, column: 6}
+                loc: {
+                  start: {
+                    line: 2,
+                    column: 0
+                  },
+                  end: {
+                    line: 2,
+                    column: 6
+                  }
+                }
               },
               arguments: [],
-              end: {line: 2, column: 8}
+              loc: {
+                start: {
+                  line: 2,
+                  column: 0
+                },
+                end: {
+                  line: 2,
+                  column: 8
+                }
+              }
             },
-            end: {line: 2, column: 9}
+            loc: {
+              start: {
+                line: 2,
+                column: 0
+              },
+              end: {
+                line: 2,
+                column: 9
+              }
+            }
           }
         ],
-        end: {line: 2, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 7
+          },
+          end: {
+            line: 2,
+            column: 11
+          }
+        }
       },
       alternate: null,
-      end: {line: 2, column: 11}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 2,
+          column: 11
+        }
+      }
     }
   ],
-  end: {line: 2, column: 11}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 2,
+      column: 11
+    }
+  }
 });
 
 test("switch (answer) { case 42: /* perfect */ bingo() }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "SwitchStatement",
-      start: {line: 1, column: 0},
       discriminant: {
         type: "Identifier",
-        start: {line: 1, column: 8},
         name: "answer",
-        end: {line: 1, column: 14}
+        loc: {
+          start: {
+            line: 1,
+            column: 8
+          },
+          end: {
+            line: 1,
+            column: 14
+          }
+        }
       },
       cases: [
         {
           type: "SwitchCase",
-          start: {line: 1, column: 18},
           consequent: [
             {
               type: "ExpressionStatement",
-              start: {line: 1, column: 41},
               expression: {
                 type: "CallExpression",
-                start: {line: 1, column: 41},
                 callee: {
                   type: "Identifier",
-                  start: {line: 1, column: 41},
                   name: "bingo",
-                  end: {line: 1, column: 46}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 41
+                    },
+                    end: {
+                      line: 1,
+                      column: 46
+                    }
+                  }
                 },
                 arguments: [],
-                end: {line: 1, column: 48}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 41
+                  },
+                  end: {
+                    line: 1,
+                    column: 48
+                  }
+                }
               },
-              end: {line: 1, column: 48}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 41
+                },
+                end: {
+                  line: 1,
+                  column: 48
+                }
+              }
             }
           ],
           test: {
             type: "Literal",
-            start: {line: 1, column: 23},
             value: 42,
-            end: {line: 1, column: 25}
+            loc: {
+              start: {
+                line: 1,
+                column: 23
+              },
+              end: {
+                line: 1,
+                column: 25
+              }
+            }
           },
-          end: {line: 1, column: 48}
+          loc: {
+            start: {
+              line: 1,
+              column: 18
+            },
+            end: {
+              line: 1,
+              column: 48
+            }
+          }
         }
       ],
-      end: {line: 1, column: 50}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 50
+        }
+      }
     }
   ],
-  end: {line: 1, column: 50}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 50
+    }
+  }
 });
 
 test("0", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: 0,
-        end: {line: 1, column: 1}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 1
+          }
+        }
       },
-      end: {line: 1, column: 1}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 1
+        }
+      }
     }
   ],
-  end: {line: 1, column: 1}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 1
+    }
+  }
 });
 
 test("3", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: 3,
-        end: {line: 1, column: 1}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 1
+          }
+        }
       },
-      end: {line: 1, column: 1}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 1
+        }
+      }
     }
   ],
-  end: {line: 1, column: 1}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 1
+    }
+  }
 });
 
 test("5", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: 5,
-        end: {line: 1, column: 1}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 1
+          }
+        }
       },
-      end: {line: 1, column: 1}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 1
+        }
+      }
     }
   ],
-  end: {line: 1, column: 1}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 1
+    }
+  }
 });
 
 test("42", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: 42,
-        end: {line: 1, column: 2}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 2
+          }
+        }
       },
-      end: {line: 1, column: 2}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 2
+        }
+      }
     }
   ],
-  end: {line: 1, column: 2}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 2
+    }
+  }
 });
 
 test(".14", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: 0.14,
-        end: {line: 1, column: 3}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 3
+          }
+        }
       },
-      end: {line: 1, column: 3}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 3
+        }
+      }
     }
   ],
-  end: {line: 1, column: 3}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 3
+    }
+  }
 });
 
 test("3.14159", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: 3.14159,
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
-      end: {line: 1, column: 7}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 7
+        }
+      }
     }
   ],
-  end: {line: 1, column: 7}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 7
+    }
+  }
 });
 
 test("6.02214179e+23", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: 6.02214179e+23,
-        end: {line: 1, column: 14}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 14
+          }
+        }
       },
-      end: {line: 1, column: 14}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 14
+        }
+      }
     }
   ],
-  end: {line: 1, column: 14}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 14
+    }
+  }
 });
 
 test("1.492417830e-10", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: 1.49241783e-10,
-        end: {line: 1, column: 15}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 15
+          }
+        }
       },
-      end: {line: 1, column: 15}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 15
+        }
+      }
     }
   ],
-  end: {line: 1, column: 15}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 15
+    }
+  }
 });
 
 test("0x0", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: 0,
-        end: {line: 1, column: 3}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 3
+          }
+        }
       },
-      end: {line: 1, column: 3}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 3
+        }
+      }
     }
   ],
-  end: {line: 1, column: 3}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 3
+    }
+  }
 });
 
 test("0e+100", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: 0,
-        end: {line: 1, column: 6}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 6
+          }
+        }
       },
-      end: {line: 1, column: 6}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 1, column: 6}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 6
+    }
+  }
 });
 
 test("0xabc", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: 2748,
-        end: {line: 1, column: 5}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 5
+          }
+        }
       },
-      end: {line: 1, column: 5}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 5
+        }
+      }
     }
   ],
-  end: {line: 1, column: 5}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 5
+    }
+  }
 });
 
 test("0xdef", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: 3567,
-        end: {line: 1, column: 5}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 5
+          }
+        }
       },
-      end: {line: 1, column: 5}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 5
+        }
+      }
     }
   ],
-  end: {line: 1, column: 5}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 5
+    }
+  }
 });
 
 test("0X1A", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: 26,
-        end: {line: 1, column: 4}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 4
+          }
+        }
       },
-      end: {line: 1, column: 4}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 4
+        }
+      }
     }
   ],
-  end: {line: 1, column: 4}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 4
+    }
+  }
 });
 
 test("0x10", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: 16,
-        end: {line: 1, column: 4}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 4
+          }
+        }
       },
-      end: {line: 1, column: 4}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 4
+        }
+      }
     }
   ],
-  end: {line: 1, column: 4}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 4
+    }
+  }
 });
 
 test("0x100", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: 256,
-        end: {line: 1, column: 5}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 5
+          }
+        }
       },
-      end: {line: 1, column: 5}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 5
+        }
+      }
     }
   ],
-  end: {line: 1, column: 5}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 5
+    }
+  }
 });
 
 test("0X04", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: 4,
-        end: {line: 1, column: 4}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 4
+          }
+        }
       },
-      end: {line: 1, column: 4}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 4
+        }
+      }
     }
   ],
-  end: {line: 1, column: 4}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 4
+    }
+  }
 });
 
 test("02", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: 2,
-        end: {line: 1, column: 2}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 2
+          }
+        }
       },
-      end: {line: 1, column: 2}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 2
+        }
+      }
     }
   ],
-  end: {line: 1, column: 2}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 2
+    }
+  }
 });
 
 test("012", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: 10,
-        end: {line: 1, column: 3}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 3
+          }
+        }
       },
-      end: {line: 1, column: 3}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 3
+        }
+      }
     }
   ],
-  end: {line: 1, column: 3}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 3
+    }
+  }
 });
 
 test("0012", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: 10,
-        end: {line: 1, column: 4}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 4
+          }
+        }
       },
-      end: {line: 1, column: 4}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 4
+        }
+      }
     }
   ],
-  end: {line: 1, column: 4}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 4
+    }
+  }
 });
 
 test("\"Hello\"", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: "Hello",
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
-      end: {line: 1, column: 7}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 7
+        }
+      }
     }
   ],
-  end: {line: 1, column: 7}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 7
+    }
+  }
 });
 
 test("\"\\n\\r\\t\\v\\b\\f\\\\\\'\\\"\\0\"", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: "\n\r\t\u000b\b\f\\'\"\u0000",
-        end: {line: 1, column: 22}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 22
+          }
+        }
       },
-      end: {line: 1, column: 22}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 22
+        }
+      }
     }
   ],
-  end: {line: 1, column: 22}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 22
+    }
+  }
 });
 
 test("\"\\u0061\"", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: "a",
-        end: {line: 1, column: 8}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 8
+          }
+        }
       },
-      end: {line: 1, column: 8}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 8
+        }
+      }
     }
   ],
-  end: {line: 1, column: 8}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 8
+    }
+  }
 });
 
 test("\"\\x61\"", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: "a",
-        end: {line: 1, column: 6}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 6
+          }
+        }
       },
-      end: {line: 1, column: 6}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 1, column: 6}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 6
+    }
+  }
 });
 
 test("\"Hello\\nworld\"", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: "Hello\nworld",
-        end: {line: 1, column: 14}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 14
+          }
+        }
       },
-      end: {line: 1, column: 14}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 14
+        }
+      }
     }
   ],
-  end: {line: 1, column: 14}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 14
+    }
+  }
 });
 
 test("\"Hello\\\nworld\"", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: "Helloworld",
-        end: {line: 2, column: 6}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 2,
+            column: 6
+          }
+        }
       },
-      end: {line: 2, column: 6}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 2,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 2, column: 6}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 2,
+      column: 6
+    }
+  }
 });
 
 test("\"Hello\\02World\"", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: "Hello\u0002World",
-        end: {line: 1, column: 15}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 15
+          }
+        }
       },
-      end: {line: 1, column: 15}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 15
+        }
+      }
     }
   ],
-  end: {line: 1, column: 15}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 15
+    }
+  }
 });
 
 test("\"Hello\\012World\"", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: "Hello\nWorld",
-        end: {line: 1, column: 16}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 16
+          }
+        }
       },
-      end: {line: 1, column: 16}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 16
+        }
+      }
     }
   ],
-  end: {line: 1, column: 16}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 16
+    }
+  }
 });
 
 test("\"Hello\\122World\"", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: "HelloRWorld",
-        end: {line: 1, column: 16}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 16
+          }
+        }
       },
-      end: {line: 1, column: 16}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 16
+        }
+      }
     }
   ],
-  end: {line: 1, column: 16}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 16
+    }
+  }
 });
 
 test("\"Hello\\0122World\"", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: "Hello\n2World",
-        end: {line: 1, column: 17}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 17
+          }
+        }
       },
-      end: {line: 1, column: 17}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 17
+        }
+      }
     }
   ],
-  end: {line: 1, column: 17}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 17
+    }
+  }
 });
 
 test("\"Hello\\312World\"", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: "HelloÊWorld",
-        end: {line: 1, column: 16}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 16
+          }
+        }
       },
-      end: {line: 1, column: 16}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 16
+        }
+      }
     }
   ],
-  end: {line: 1, column: 16}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 16
+    }
+  }
 });
 
 test("\"Hello\\412World\"", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: "Hello!2World",
-        end: {line: 1, column: 16}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 16
+          }
+        }
       },
-      end: {line: 1, column: 16}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 16
+        }
+      }
     }
   ],
-  end: {line: 1, column: 16}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 16
+    }
+  }
 });
 
 test("\"Hello\\812World\"", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: "Hello812World",
-        end: {line: 1, column: 16}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 16
+          }
+        }
       },
-      end: {line: 1, column: 16}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 16
+        }
+      }
     }
   ],
-  end: {line: 1, column: 16}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 16
+    }
+  }
 });
 
 test("\"Hello\\712World\"", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: "Hello92World",
-        end: {line: 1, column: 16}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 16
+          }
+        }
       },
-      end: {line: 1, column: 16}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 16
+        }
+      }
     }
   ],
-  end: {line: 1, column: 16}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 16
+    }
+  }
 });
 
 test("\"Hello\\0World\"", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: "Hello\u0000World",
-        end: {line: 1, column: 14}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 14
+          }
+        }
       },
-      end: {line: 1, column: 14}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 14
+        }
+      }
     }
   ],
-  end: {line: 1, column: 14}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 14
+    }
+  }
 });
 
 test("\"Hello\\\r\nworld\"", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: "Helloworld",
-        end: {line: 2, column: 6}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 2,
+            column: 6
+          }
+        }
       },
-      end: {line: 2, column: 6}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 2,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 2, column: 6}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 2,
+      column: 6
+    }
+  }
 });
 
 test("\"Hello\\1World\"", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Literal",
-        start: {line: 1, column: 0},
         value: "Hello\u0001World",
-        end: {line: 1, column: 14}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 14
+          }
+        }
       },
-      end: {line: 1, column: 14}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 14
+        }
+      }
     }
   ],
-  end: {line: 1, column: 14}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 14
+    }
+  }
 });
 
 test("var x = /[a-z]/i", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "VariableDeclaration",
-      start: {line: 1, column: 0},
       declarations: [
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 4},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "x",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
           init: {
             type: "Literal",
-            start: {line: 1, column: 8},
             value: {},
-            end: {line: 1, column: 16}
+            loc: {
+              start: {
+                line: 1,
+                column: 8
+              },
+              end: {
+                line: 1,
+                column: 16
+              }
+            }
           },
-          end: {line: 1, column: 16}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 16
+            }
+          }
         }
       ],
       kind: "var",
-      end: {line: 1, column: 16}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 16
+        }
+      }
     }
   ],
-  end: {line: 1, column: 16}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 16
+    }
+  }
 });
 
 test("var x = /[x-z]/i", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "VariableDeclaration",
-      start: {line: 1, column: 0},
       declarations: [
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 4},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "x",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
           init: {
             type: "Literal",
-            start: {line: 1, column: 8},
             value: {},
-            end: {line: 1, column: 16}
+            loc: {
+              start: {
+                line: 1,
+                column: 8
+              },
+              end: {
+                line: 1,
+                column: 16
+              }
+            }
           },
-          end: {line: 1, column: 16}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 16
+            }
+          }
         }
       ],
       kind: "var",
-      end: {line: 1, column: 16}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 16
+        }
+      }
     }
   ],
-  end: {line: 1, column: 16}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 16
+    }
+  }
 });
 
 test("var x = /[a-c]/i", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "VariableDeclaration",
-      start: {line: 1, column: 0},
       declarations: [
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 4},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "x",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
           init: {
             type: "Literal",
-            start: {line: 1, column: 8},
             value: {},
-            end: {line: 1, column: 16}
+            loc: {
+              start: {
+                line: 1,
+                column: 8
+              },
+              end: {
+                line: 1,
+                column: 16
+              }
+            }
           },
-          end: {line: 1, column: 16}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 16
+            }
+          }
         }
       ],
       kind: "var",
-      end: {line: 1, column: 16}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 16
+        }
+      }
     }
   ],
-  end: {line: 1, column: 16}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 16
+    }
+  }
 });
 
 test("var x = /[P QR]/i", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "VariableDeclaration",
-      start: {line: 1, column: 0},
       declarations: [
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 4},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "x",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
           init: {
             type: "Literal",
-            start: {line: 1, column: 8},
             value: {},
-            end: {line: 1, column: 17}
+            loc: {
+              start: {
+                line: 1,
+                column: 8
+              },
+              end: {
+                line: 1,
+                column: 17
+              }
+            }
           },
-          end: {line: 1, column: 17}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 17
+            }
+          }
         }
       ],
       kind: "var",
-      end: {line: 1, column: 17}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 17
+        }
+      }
     }
   ],
-  end: {line: 1, column: 17}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 17
+    }
+  }
 });
 
 test("var x = /foo\\/bar/", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "VariableDeclaration",
-      start: {line: 1, column: 0},
       declarations: [
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 4},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "x",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
           init: {
             type: "Literal",
-            start: {line: 1, column: 8},
             value: {},
-            end: {line: 1, column: 18}
+            loc: {
+              start: {
+                line: 1,
+                column: 8
+              },
+              end: {
+                line: 1,
+                column: 18
+              }
+            }
           },
-          end: {line: 1, column: 18}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 18
+            }
+          }
         }
       ],
       kind: "var",
-      end: {line: 1, column: 18}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 18
+        }
+      }
     }
   ],
-  end: {line: 1, column: 18}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 18
+    }
+  }
 });
 
 test("var x = /=([^=\\s])+/g", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "VariableDeclaration",
-      start: {line: 1, column: 0},
       declarations: [
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 4},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "x",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
           init: {
             type: "Literal",
-            start: {line: 1, column: 8},
             value: {},
-            end: {line: 1, column: 21}
+            loc: {
+              start: {
+                line: 1,
+                column: 8
+              },
+              end: {
+                line: 1,
+                column: 21
+              }
+            }
           },
-          end: {line: 1, column: 21}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 21
+            }
+          }
         }
       ],
       kind: "var",
-      end: {line: 1, column: 21}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 21
+        }
+      }
     }
   ],
-  end: {line: 1, column: 21}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 21
+    }
+  }
 });
 
 test("var x = /[P QR]/\\u0067", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "VariableDeclaration",
-      start: {line: 1, column: 0},
       declarations: [
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 4},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "x",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
           init: {
             type: "Literal",
-            start: {line: 1, column: 8},
             value: {},
-            end: {line: 1, column: 22}
+            loc: {
+              start: {
+                line: 1,
+                column: 8
+              },
+              end: {
+                line: 1,
+                column: 22
+              }
+            }
           },
-          end: {line: 1, column: 22}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 22
+            }
+          }
         }
       ],
       kind: "var",
-      end: {line: 1, column: 22}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 22
+        }
+      }
     }
   ],
-  end: {line: 1, column: 22}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 22
+    }
+  }
 });
 
 test("new Button", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "NewExpression",
-        start: {line: 1, column: 0},
         callee: {
           type: "Identifier",
-          start: {line: 1, column: 4},
           name: "Button",
-          end: {line: 1, column: 10}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 10
+            }
+          }
         },
         arguments: [],
-        end: {line: 1, column: 10}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 10
+          }
+        }
       },
-      end: {line: 1, column: 10}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 10
+        }
+      }
     }
   ],
-  end: {line: 1, column: 10}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 10
+    }
+  }
 });
 
 test("new Button()", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "NewExpression",
-        start: {line: 1, column: 0},
         callee: {
           type: "Identifier",
-          start: {line: 1, column: 4},
           name: "Button",
-          end: {line: 1, column: 10}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 10
+            }
+          }
         },
         arguments: [],
-        end: {line: 1, column: 12}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 12
+          }
+        }
       },
-      end: {line: 1, column: 12}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 12
+        }
+      }
     }
   ],
-  end: {line: 1, column: 12}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 12
+    }
+  }
 });
 
 test("new new foo", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "NewExpression",
-        start: {line: 1, column: 0},
         callee: {
           type: "NewExpression",
-          start: {line: 1, column: 4},
           callee: {
             type: "Identifier",
-            start: {line: 1, column: 8},
             name: "foo",
-            end: {line: 1, column: 11}
+            loc: {
+              start: {
+                line: 1,
+                column: 8
+              },
+              end: {
+                line: 1,
+                column: 11
+              }
+            }
           },
           arguments: [],
-          end: {line: 1, column: 11}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 11
+            }
+          }
         },
         arguments: [],
-        end: {line: 1, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 11
+          }
+        }
       },
-      end: {line: 1, column: 11}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 11
+        }
+      }
     }
   ],
-  end: {line: 1, column: 11}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 11
+    }
+  }
 });
 
 test("new new foo()", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "NewExpression",
-        start: {line: 1, column: 0},
         callee: {
           type: "NewExpression",
-          start: {line: 1, column: 4},
           callee: {
             type: "Identifier",
-            start: {line: 1, column: 8},
             name: "foo",
-            end: {line: 1, column: 11}
+            loc: {
+              start: {
+                line: 1,
+                column: 8
+              },
+              end: {
+                line: 1,
+                column: 11
+              }
+            }
           },
           arguments: [],
-          end: {line: 1, column: 13}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 13
+            }
+          }
         },
         arguments: [],
-        end: {line: 1, column: 13}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 13
+          }
+        }
       },
-      end: {line: 1, column: 13}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 13
+        }
+      }
     }
   ],
-  end: {line: 1, column: 13}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 13
+    }
+  }
 });
 
 test("new foo().bar()", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "CallExpression",
-        start: {line: 1, column: 0},
         callee: {
           type: "MemberExpression",
-          start: {line: 1, column: 0},
           object: {
             type: "NewExpression",
-            start: {line: 1, column: 0},
             callee: {
               type: "Identifier",
-              start: {line: 1, column: 4},
               name: "foo",
-              end: {line: 1, column: 7}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 4
+                },
+                end: {
+                  line: 1,
+                  column: 7
+                }
+              }
             },
             arguments: [],
-            end: {line: 1, column: 9}
+            loc: {
+              start: {
+                line: 1,
+                column: 0
+              },
+              end: {
+                line: 1,
+                column: 9
+              }
+            }
           },
           property: {
             type: "Identifier",
-            start: {line: 1, column: 10},
             name: "bar",
-            end: {line: 1, column: 13}
+            loc: {
+              start: {
+                line: 1,
+                column: 10
+              },
+              end: {
+                line: 1,
+                column: 13
+              }
+            }
           },
           computed: false,
-          end: {line: 1, column: 13}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 13
+            }
+          }
         },
         arguments: [],
-        end: {line: 1, column: 15}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 15
+          }
+        }
       },
-      end: {line: 1, column: 15}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 15
+        }
+      }
     }
   ],
-  end: {line: 1, column: 15}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 15
+    }
+  }
 });
 
 test("new foo[bar]", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "NewExpression",
-        start: {line: 1, column: 0},
         callee: {
           type: "MemberExpression",
-          start: {line: 1, column: 4},
           object: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "foo",
-            end: {line: 1, column: 7}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 7
+              }
+            }
           },
           property: {
             type: "Identifier",
-            start: {line: 1, column: 8},
             name: "bar",
-            end: {line: 1, column: 11}
+            loc: {
+              start: {
+                line: 1,
+                column: 8
+              },
+              end: {
+                line: 1,
+                column: 11
+              }
+            }
           },
           computed: true,
-          end: {line: 1, column: 12}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 12
+            }
+          }
         },
         arguments: [],
-        end: {line: 1, column: 12}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 12
+          }
+        }
       },
-      end: {line: 1, column: 12}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 12
+        }
+      }
     }
   ],
-  end: {line: 1, column: 12}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 12
+    }
+  }
 });
 
 test("new foo.bar()", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "NewExpression",
-        start: {line: 1, column: 0},
         callee: {
           type: "MemberExpression",
-          start: {line: 1, column: 4},
           object: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "foo",
-            end: {line: 1, column: 7}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 7
+              }
+            }
           },
           property: {
             type: "Identifier",
-            start: {line: 1, column: 8},
             name: "bar",
-            end: {line: 1, column: 11}
+            loc: {
+              start: {
+                line: 1,
+                column: 8
+              },
+              end: {
+                line: 1,
+                column: 11
+              }
+            }
           },
           computed: false,
-          end: {line: 1, column: 11}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 11
+            }
+          }
         },
         arguments: [],
-        end: {line: 1, column: 13}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 13
+          }
+        }
       },
-      end: {line: 1, column: 13}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 13
+        }
+      }
     }
   ],
-  end: {line: 1, column: 13}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 13
+    }
+  }
 });
 
 test("( new foo).bar()", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "CallExpression",
-        start: {line: 1, column: 2},
         callee: {
           type: "MemberExpression",
-          start: {line: 1, column: 2},
           object: {
             type: "NewExpression",
-            start: {line: 1, column: 2},
             callee: {
               type: "Identifier",
-              start: {line: 1, column: 6},
               name: "foo",
-              end: {line: 1, column: 9}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 6
+                },
+                end: {
+                  line: 1,
+                  column: 9
+                }
+              }
             },
             arguments: [],
-            end: {line: 1, column: 9}
+            loc: {
+              start: {
+                line: 1,
+                column: 2
+              },
+              end: {
+                line: 1,
+                column: 9
+              }
+            }
           },
           property: {
             type: "Identifier",
-            start: {line: 1, column: 11},
             name: "bar",
-            end: {line: 1, column: 14}
+            loc: {
+              start: {
+                line: 1,
+                column: 11
+              },
+              end: {
+                line: 1,
+                column: 14
+              }
+            }
           },
           computed: false,
-          end: {line: 1, column: 14}
+          loc: {
+            start: {
+              line: 1,
+              column: 2
+            },
+            end: {
+              line: 1,
+              column: 14
+            }
+          }
         },
         arguments: [],
-        end: {line: 1, column: 16}
+        loc: {
+          start: {
+            line: 1,
+            column: 2
+          },
+          end: {
+            line: 1,
+            column: 16
+          }
+        }
       },
-      end: {line: 1, column: 16}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 16
+        }
+      }
     }
   ],
-  end: {line: 1, column: 16}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 16
+    }
+  }
 });
 
 test("foo(bar, baz)", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "CallExpression",
-        start: {line: 1, column: 0},
         callee: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "foo",
-          end: {line: 1, column: 3}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 3
+            }
+          }
         },
         arguments: [
           {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "bar",
-            end: {line: 1, column: 7}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 7
+              }
+            }
           },
           {
             type: "Identifier",
-            start: {line: 1, column: 9},
             name: "baz",
-            end: {line: 1, column: 12}
+            loc: {
+              start: {
+                line: 1,
+                column: 9
+              },
+              end: {
+                line: 1,
+                column: 12
+              }
+            }
           }
         ],
-        end: {line: 1, column: 13}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 13
+          }
+        }
       },
-      end: {line: 1, column: 13}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 13
+        }
+      }
     }
   ],
-  end: {line: 1, column: 13}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 13
+    }
+  }
 });
 
 test("(    foo  )()", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "CallExpression",
-        start: {line: 1, column: 5},
         callee: {
           type: "Identifier",
-          start: {line: 1, column: 5},
           name: "foo",
-          end: {line: 1, column: 8}
+          loc: {
+            start: {
+              line: 1,
+              column: 5
+            },
+            end: {
+              line: 1,
+              column: 8
+            }
+          }
         },
         arguments: [],
-        end: {line: 1, column: 13}
+        loc: {
+          start: {
+            line: 1,
+            column: 5
+          },
+          end: {
+            line: 1,
+            column: 13
+          }
+        }
       },
-      end: {line: 1, column: 13}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 13
+        }
+      }
     }
   ],
-  end: {line: 1, column: 13}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 13
+    }
+  }
 });
 
 test("universe.milkyway", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "MemberExpression",
-        start: {line: 1, column: 0},
         object: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "universe",
-          end: {line: 1, column: 8}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 8
+            }
+          }
         },
         property: {
           type: "Identifier",
-          start: {line: 1, column: 9},
           name: "milkyway",
-          end: {line: 1, column: 17}
+          loc: {
+            start: {
+              line: 1,
+              column: 9
+            },
+            end: {
+              line: 1,
+              column: 17
+            }
+          }
         },
         computed: false,
-        end: {line: 1, column: 17}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 17
+          }
+        }
       },
-      end: {line: 1, column: 17}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 17
+        }
+      }
     }
   ],
-  end: {line: 1, column: 17}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 17
+    }
+  }
 });
 
 test("universe.milkyway.solarsystem", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "MemberExpression",
-        start: {line: 1, column: 0},
         object: {
           type: "MemberExpression",
-          start: {line: 1, column: 0},
           object: {
             type: "Identifier",
-            start: {line: 1, column: 0},
             name: "universe",
-            end: {line: 1, column: 8}
+            loc: {
+              start: {
+                line: 1,
+                column: 0
+              },
+              end: {
+                line: 1,
+                column: 8
+              }
+            }
           },
           property: {
             type: "Identifier",
-            start: {line: 1, column: 9},
             name: "milkyway",
-            end: {line: 1, column: 17}
+            loc: {
+              start: {
+                line: 1,
+                column: 9
+              },
+              end: {
+                line: 1,
+                column: 17
+              }
+            }
           },
           computed: false,
-          end: {line: 1, column: 17}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 17
+            }
+          }
         },
         property: {
           type: "Identifier",
-          start: {line: 1, column: 18},
           name: "solarsystem",
-          end: {line: 1, column: 29}
+          loc: {
+            start: {
+              line: 1,
+              column: 18
+            },
+            end: {
+              line: 1,
+              column: 29
+            }
+          }
         },
         computed: false,
-        end: {line: 1, column: 29}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 29
+          }
+        }
       },
-      end: {line: 1, column: 29}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 29
+        }
+      }
     }
   ],
-  end: {line: 1, column: 29}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 29
+    }
+  }
 });
 
 test("universe.milkyway.solarsystem.Earth", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "MemberExpression",
-        start: {line: 1, column: 0},
         object: {
           type: "MemberExpression",
-          start: {line: 1, column: 0},
           object: {
             type: "MemberExpression",
-            start: {line: 1, column: 0},
             object: {
               type: "Identifier",
-              start: {line: 1, column: 0},
               name: "universe",
-              end: {line: 1, column: 8}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 0
+                },
+                end: {
+                  line: 1,
+                  column: 8
+                }
+              }
             },
             property: {
               type: "Identifier",
-              start: {line: 1, column: 9},
               name: "milkyway",
-              end: {line: 1, column: 17}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 9
+                },
+                end: {
+                  line: 1,
+                  column: 17
+                }
+              }
             },
             computed: false,
-            end: {line: 1, column: 17}
+            loc: {
+              start: {
+                line: 1,
+                column: 0
+              },
+              end: {
+                line: 1,
+                column: 17
+              }
+            }
           },
           property: {
             type: "Identifier",
-            start: {line: 1, column: 18},
             name: "solarsystem",
-            end: {line: 1, column: 29}
+            loc: {
+              start: {
+                line: 1,
+                column: 18
+              },
+              end: {
+                line: 1,
+                column: 29
+              }
+            }
           },
           computed: false,
-          end: {line: 1, column: 29}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 29
+            }
+          }
         },
         property: {
           type: "Identifier",
-          start: {line: 1, column: 30},
           name: "Earth",
-          end: {line: 1, column: 35}
+          loc: {
+            start: {
+              line: 1,
+              column: 30
+            },
+            end: {
+              line: 1,
+              column: 35
+            }
+          }
         },
         computed: false,
-        end: {line: 1, column: 35}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 35
+          }
+        }
       },
-      end: {line: 1, column: 35}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 35
+        }
+      }
     }
   ],
-  end: {line: 1, column: 35}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 35
+    }
+  }
 });
 
 test("universe[galaxyName, otherUselessName]", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "MemberExpression",
-        start: {line: 1, column: 0},
         object: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "universe",
-          end: {line: 1, column: 8}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 8
+            }
+          }
         },
         property: {
           type: "SequenceExpression",
-          start: {line: 1, column: 9},
           expressions: [
             {
               type: "Identifier",
-              start: {line: 1, column: 9},
               name: "galaxyName",
-              end: {line: 1, column: 19}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 9
+                },
+                end: {
+                  line: 1,
+                  column: 19
+                }
+              }
             },
             {
               type: "Identifier",
-              start: {line: 1, column: 21},
               name: "otherUselessName",
-              end: {line: 1, column: 37}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 21
+                },
+                end: {
+                  line: 1,
+                  column: 37
+                }
+              }
             }
           ],
-          end: {line: 1, column: 37}
+          loc: {
+            start: {
+              line: 1,
+              column: 9
+            },
+            end: {
+              line: 1,
+              column: 37
+            }
+          }
         },
         computed: true,
-        end: {line: 1, column: 38}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 38
+          }
+        }
       },
-      end: {line: 1, column: 38}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 38
+        }
+      }
     }
   ],
-  end: {line: 1, column: 38}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 38
+    }
+  }
 });
 
 test("universe[galaxyName]", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "MemberExpression",
-        start: {line: 1, column: 0},
         object: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "universe",
-          end: {line: 1, column: 8}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 8
+            }
+          }
         },
         property: {
           type: "Identifier",
-          start: {line: 1, column: 9},
           name: "galaxyName",
-          end: {line: 1, column: 19}
+          loc: {
+            start: {
+              line: 1,
+              column: 9
+            },
+            end: {
+              line: 1,
+              column: 19
+            }
+          }
         },
         computed: true,
-        end: {line: 1, column: 20}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 20
+          }
+        }
       },
-      end: {line: 1, column: 20}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 20
+        }
+      }
     }
   ],
-  end: {line: 1, column: 20}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 20
+    }
+  }
 });
 
 test("universe[42].galaxies", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "MemberExpression",
-        start: {line: 1, column: 0},
         object: {
           type: "MemberExpression",
-          start: {line: 1, column: 0},
           object: {
             type: "Identifier",
-            start: {line: 1, column: 0},
             name: "universe",
-            end: {line: 1, column: 8}
+            loc: {
+              start: {
+                line: 1,
+                column: 0
+              },
+              end: {
+                line: 1,
+                column: 8
+              }
+            }
           },
           property: {
             type: "Literal",
-            start: {line: 1, column: 9},
             value: 42,
-            end: {line: 1, column: 11}
+            loc: {
+              start: {
+                line: 1,
+                column: 9
+              },
+              end: {
+                line: 1,
+                column: 11
+              }
+            }
           },
           computed: true,
-          end: {line: 1, column: 12}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 12
+            }
+          }
         },
         property: {
           type: "Identifier",
-          start: {line: 1, column: 13},
           name: "galaxies",
-          end: {line: 1, column: 21}
+          loc: {
+            start: {
+              line: 1,
+              column: 13
+            },
+            end: {
+              line: 1,
+              column: 21
+            }
+          }
         },
         computed: false,
-        end: {line: 1, column: 21}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 21
+          }
+        }
       },
-      end: {line: 1, column: 21}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 21
+        }
+      }
     }
   ],
-  end: {line: 1, column: 21}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 21
+    }
+  }
 });
 
 test("universe(42).galaxies", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "MemberExpression",
-        start: {line: 1, column: 0},
         object: {
           type: "CallExpression",
-          start: {line: 1, column: 0},
           callee: {
             type: "Identifier",
-            start: {line: 1, column: 0},
             name: "universe",
-            end: {line: 1, column: 8}
+            loc: {
+              start: {
+                line: 1,
+                column: 0
+              },
+              end: {
+                line: 1,
+                column: 8
+              }
+            }
           },
           arguments: [
             {
               type: "Literal",
-              start: {line: 1, column: 9},
               value: 42,
-              end: {line: 1, column: 11}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 9
+                },
+                end: {
+                  line: 1,
+                  column: 11
+                }
+              }
             }
           ],
-          end: {line: 1, column: 12}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 12
+            }
+          }
         },
         property: {
           type: "Identifier",
-          start: {line: 1, column: 13},
           name: "galaxies",
-          end: {line: 1, column: 21}
+          loc: {
+            start: {
+              line: 1,
+              column: 13
+            },
+            end: {
+              line: 1,
+              column: 21
+            }
+          }
         },
         computed: false,
-        end: {line: 1, column: 21}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 21
+          }
+        }
       },
-      end: {line: 1, column: 21}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 21
+        }
+      }
     }
   ],
-  end: {line: 1, column: 21}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 21
+    }
+  }
 });
 
 test("universe(42).galaxies(14, 3, 77).milkyway", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "MemberExpression",
-        start: {line: 1, column: 0},
         object: {
           type: "CallExpression",
-          start: {line: 1, column: 0},
           callee: {
             type: "MemberExpression",
-            start: {line: 1, column: 0},
             object: {
               type: "CallExpression",
-              start: {line: 1, column: 0},
               callee: {
                 type: "Identifier",
-                start: {line: 1, column: 0},
                 name: "universe",
-                end: {line: 1, column: 8}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 0
+                  },
+                  end: {
+                    line: 1,
+                    column: 8
+                  }
+                }
               },
               arguments: [
                 {
                   type: "Literal",
-                  start: {line: 1, column: 9},
                   value: 42,
-                  end: {line: 1, column: 11}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 9
+                    },
+                    end: {
+                      line: 1,
+                      column: 11
+                    }
+                  }
                 }
               ],
-              end: {line: 1, column: 12}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 0
+                },
+                end: {
+                  line: 1,
+                  column: 12
+                }
+              }
             },
             property: {
               type: "Identifier",
-              start: {line: 1, column: 13},
               name: "galaxies",
-              end: {line: 1, column: 21}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 13
+                },
+                end: {
+                  line: 1,
+                  column: 21
+                }
+              }
             },
             computed: false,
-            end: {line: 1, column: 21}
+            loc: {
+              start: {
+                line: 1,
+                column: 0
+              },
+              end: {
+                line: 1,
+                column: 21
+              }
+            }
           },
           arguments: [
             {
               type: "Literal",
-              start: {line: 1, column: 22},
               value: 14,
-              end: {line: 1, column: 24}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 22
+                },
+                end: {
+                  line: 1,
+                  column: 24
+                }
+              }
             },
             {
               type: "Literal",
-              start: {line: 1, column: 26},
               value: 3,
-              end: {line: 1, column: 27}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 26
+                },
+                end: {
+                  line: 1,
+                  column: 27
+                }
+              }
             },
             {
               type: "Literal",
-              start: {line: 1, column: 29},
               value: 77,
-              end: {line: 1, column: 31}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 29
+                },
+                end: {
+                  line: 1,
+                  column: 31
+                }
+              }
             }
           ],
-          end: {line: 1, column: 32}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 32
+            }
+          }
         },
         property: {
           type: "Identifier",
-          start: {line: 1, column: 33},
           name: "milkyway",
-          end: {line: 1, column: 41}
+          loc: {
+            start: {
+              line: 1,
+              column: 33
+            },
+            end: {
+              line: 1,
+              column: 41
+            }
+          }
         },
         computed: false,
-        end: {line: 1, column: 41}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 41
+          }
+        }
       },
-      end: {line: 1, column: 41}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 41
+        }
+      }
     }
   ],
-  end: {line: 1, column: 41}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 41
+    }
+  }
 });
 
 test("earth.asia.Indonesia.prepareForElection(2014)", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "CallExpression",
-        start: {line: 1, column: 0},
         callee: {
           type: "MemberExpression",
-          start: {line: 1, column: 0},
           object: {
             type: "MemberExpression",
-            start: {line: 1, column: 0},
             object: {
               type: "MemberExpression",
-              start: {line: 1, column: 0},
               object: {
                 type: "Identifier",
-                start: {line: 1, column: 0},
                 name: "earth",
-                end: {line: 1, column: 5}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 0
+                  },
+                  end: {
+                    line: 1,
+                    column: 5
+                  }
+                }
               },
               property: {
                 type: "Identifier",
-                start: {line: 1, column: 6},
                 name: "asia",
-                end: {line: 1, column: 10}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 6
+                  },
+                  end: {
+                    line: 1,
+                    column: 10
+                  }
+                }
               },
               computed: false,
-              end: {line: 1, column: 10}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 0
+                },
+                end: {
+                  line: 1,
+                  column: 10
+                }
+              }
             },
             property: {
               type: "Identifier",
-              start: {line: 1, column: 11},
               name: "Indonesia",
-              end: {line: 1, column: 20}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 11
+                },
+                end: {
+                  line: 1,
+                  column: 20
+                }
+              }
             },
             computed: false,
-            end: {line: 1, column: 20}
+            loc: {
+              start: {
+                line: 1,
+                column: 0
+              },
+              end: {
+                line: 1,
+                column: 20
+              }
+            }
           },
           property: {
             type: "Identifier",
-            start: {line: 1, column: 21},
             name: "prepareForElection",
-            end: {line: 1, column: 39}
+            loc: {
+              start: {
+                line: 1,
+                column: 21
+              },
+              end: {
+                line: 1,
+                column: 39
+              }
+            }
           },
           computed: false,
-          end: {line: 1, column: 39}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 39
+            }
+          }
         },
         arguments: [
           {
             type: "Literal",
-            start: {line: 1, column: 40},
             value: 2014,
-            end: {line: 1, column: 44}
+            loc: {
+              start: {
+                line: 1,
+                column: 40
+              },
+              end: {
+                line: 1,
+                column: 44
+              }
+            }
           }
         ],
-        end: {line: 1, column: 45}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 45
+          }
+        }
       },
-      end: {line: 1, column: 45}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 45
+        }
+      }
     }
   ],
-  end: {line: 1, column: 45}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 45
+    }
+  }
 });
 
 test("universe.if", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "MemberExpression",
-        start: {line: 1, column: 0},
         object: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "universe",
-          end: {line: 1, column: 8}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 8
+            }
+          }
         },
         property: {
           type: "Identifier",
-          start: {line: 1, column: 9},
           name: "if",
-          end: {line: 1, column: 11}
+          loc: {
+            start: {
+              line: 1,
+              column: 9
+            },
+            end: {
+              line: 1,
+              column: 11
+            }
+          }
         },
         computed: false,
-        end: {line: 1, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 11
+          }
+        }
       },
-      end: {line: 1, column: 11}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 11
+        }
+      }
     }
   ],
-  end: {line: 1, column: 11}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 11
+    }
+  }
 });
 
 test("universe.true", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "MemberExpression",
-        start: {line: 1, column: 0},
         object: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "universe",
-          end: {line: 1, column: 8}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 8
+            }
+          }
         },
         property: {
           type: "Identifier",
-          start: {line: 1, column: 9},
           name: "true",
-          end: {line: 1, column: 13}
+          loc: {
+            start: {
+              line: 1,
+              column: 9
+            },
+            end: {
+              line: 1,
+              column: 13
+            }
+          }
         },
         computed: false,
-        end: {line: 1, column: 13}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 13
+          }
+        }
       },
-      end: {line: 1, column: 13}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 13
+        }
+      }
     }
   ],
-  end: {line: 1, column: 13}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 13
+    }
+  }
 });
 
 test("universe.false", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "MemberExpression",
-        start: {line: 1, column: 0},
         object: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "universe",
-          end: {line: 1, column: 8}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 8
+            }
+          }
         },
         property: {
           type: "Identifier",
-          start: {line: 1, column: 9},
           name: "false",
-          end: {line: 1, column: 14}
+          loc: {
+            start: {
+              line: 1,
+              column: 9
+            },
+            end: {
+              line: 1,
+              column: 14
+            }
+          }
         },
         computed: false,
-        end: {line: 1, column: 14}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 14
+          }
+        }
       },
-      end: {line: 1, column: 14}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 14
+        }
+      }
     }
   ],
-  end: {line: 1, column: 14}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 14
+    }
+  }
 });
 
 test("universe.null", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "MemberExpression",
-        start: {line: 1, column: 0},
         object: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "universe",
-          end: {line: 1, column: 8}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 8
+            }
+          }
         },
         property: {
           type: "Identifier",
-          start: {line: 1, column: 9},
           name: "null",
-          end: {line: 1, column: 13}
+          loc: {
+            start: {
+              line: 1,
+              column: 9
+            },
+            end: {
+              line: 1,
+              column: 13
+            }
+          }
         },
         computed: false,
-        end: {line: 1, column: 13}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 13
+          }
+        }
       },
-      end: {line: 1, column: 13}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 13
+        }
+      }
     }
   ],
-  end: {line: 1, column: 13}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 13
+    }
+  }
 });
 
 test("x++", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "UpdateExpression",
-        start: {line: 1, column: 0},
         operator: "++",
         prefix: false,
         argument: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
-        end: {line: 1, column: 3}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 3
+          }
+        }
       },
-      end: {line: 1, column: 3}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 3
+        }
+      }
     }
   ],
-  end: {line: 1, column: 3}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 3
+    }
+  }
 });
 
 test("x--", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "UpdateExpression",
-        start: {line: 1, column: 0},
         operator: "--",
         prefix: false,
         argument: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
-        end: {line: 1, column: 3}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 3
+          }
+        }
       },
-      end: {line: 1, column: 3}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 3
+        }
+      }
     }
   ],
-  end: {line: 1, column: 3}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 3
+    }
+  }
 });
 
 test("eval++", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "UpdateExpression",
-        start: {line: 1, column: 0},
         operator: "++",
         prefix: false,
         argument: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "eval",
-          end: {line: 1, column: 4}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 4
+            }
+          }
         },
-        end: {line: 1, column: 6}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 6
+          }
+        }
       },
-      end: {line: 1, column: 6}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 1, column: 6}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 6
+    }
+  }
 });
 
 test("eval--", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "UpdateExpression",
-        start: {line: 1, column: 0},
         operator: "--",
         prefix: false,
         argument: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "eval",
-          end: {line: 1, column: 4}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 4
+            }
+          }
         },
-        end: {line: 1, column: 6}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 6
+          }
+        }
       },
-      end: {line: 1, column: 6}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 1, column: 6}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 6
+    }
+  }
 });
 
 test("arguments++", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "UpdateExpression",
-        start: {line: 1, column: 0},
         operator: "++",
         prefix: false,
         argument: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "arguments",
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 11
+          }
+        }
       },
-      end: {line: 1, column: 11}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 11
+        }
+      }
     }
   ],
-  end: {line: 1, column: 11}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 11
+    }
+  }
 });
 
 test("arguments--", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "UpdateExpression",
-        start: {line: 1, column: 0},
         operator: "--",
         prefix: false,
         argument: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "arguments",
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 11
+          }
+        }
       },
-      end: {line: 1, column: 11}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 11
+        }
+      }
     }
   ],
-  end: {line: 1, column: 11}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 11
+    }
+  }
 });
 
 test("++x", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "UpdateExpression",
-        start: {line: 1, column: 0},
         operator: "++",
         prefix: true,
         argument: {
           type: "Identifier",
-          start: {line: 1, column: 2},
           name: "x",
-          end: {line: 1, column: 3}
+          loc: {
+            start: {
+              line: 1,
+              column: 2
+            },
+            end: {
+              line: 1,
+              column: 3
+            }
+          }
         },
-        end: {line: 1, column: 3}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 3
+          }
+        }
       },
-      end: {line: 1, column: 3}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 3
+        }
+      }
     }
   ],
-  end: {line: 1, column: 3}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 3
+    }
+  }
 });
 
 test("--x", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "UpdateExpression",
-        start: {line: 1, column: 0},
         operator: "--",
         prefix: true,
         argument: {
           type: "Identifier",
-          start: {line: 1, column: 2},
           name: "x",
-          end: {line: 1, column: 3}
+          loc: {
+            start: {
+              line: 1,
+              column: 2
+            },
+            end: {
+              line: 1,
+              column: 3
+            }
+          }
         },
-        end: {line: 1, column: 3}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 3
+          }
+        }
       },
-      end: {line: 1, column: 3}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 3
+        }
+      }
     }
   ],
-  end: {line: 1, column: 3}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 3
+    }
+  }
 });
 
 test("++eval", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "UpdateExpression",
-        start: {line: 1, column: 0},
         operator: "++",
         prefix: true,
         argument: {
           type: "Identifier",
-          start: {line: 1, column: 2},
           name: "eval",
-          end: {line: 1, column: 6}
+          loc: {
+            start: {
+              line: 1,
+              column: 2
+            },
+            end: {
+              line: 1,
+              column: 6
+            }
+          }
         },
-        end: {line: 1, column: 6}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 6
+          }
+        }
       },
-      end: {line: 1, column: 6}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 1, column: 6}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 6
+    }
+  }
 });
 
 test("--eval", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "UpdateExpression",
-        start: {line: 1, column: 0},
         operator: "--",
         prefix: true,
         argument: {
           type: "Identifier",
-          start: {line: 1, column: 2},
           name: "eval",
-          end: {line: 1, column: 6}
+          loc: {
+            start: {
+              line: 1,
+              column: 2
+            },
+            end: {
+              line: 1,
+              column: 6
+            }
+          }
         },
-        end: {line: 1, column: 6}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 6
+          }
+        }
       },
-      end: {line: 1, column: 6}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 1, column: 6}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 6
+    }
+  }
 });
 
 test("++arguments", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "UpdateExpression",
-        start: {line: 1, column: 0},
         operator: "++",
         prefix: true,
         argument: {
           type: "Identifier",
-          start: {line: 1, column: 2},
           name: "arguments",
-          end: {line: 1, column: 11}
+          loc: {
+            start: {
+              line: 1,
+              column: 2
+            },
+            end: {
+              line: 1,
+              column: 11
+            }
+          }
         },
-        end: {line: 1, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 11
+          }
+        }
       },
-      end: {line: 1, column: 11}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 11
+        }
+      }
     }
   ],
-  end: {line: 1, column: 11}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 11
+    }
+  }
 });
 
 test("--arguments", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "UpdateExpression",
-        start: {line: 1, column: 0},
         operator: "--",
         prefix: true,
         argument: {
           type: "Identifier",
-          start: {line: 1, column: 2},
           name: "arguments",
-          end: {line: 1, column: 11}
+          loc: {
+            start: {
+              line: 1,
+              column: 2
+            },
+            end: {
+              line: 1,
+              column: 11
+            }
+          }
         },
-        end: {line: 1, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 11
+          }
+        }
       },
-      end: {line: 1, column: 11}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 11
+        }
+      }
     }
   ],
-  end: {line: 1, column: 11}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 11
+    }
+  }
 });
 
 test("+x", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "UnaryExpression",
-        start: {line: 1, column: 0},
         operator: "+",
         prefix: true,
         argument: {
           type: "Identifier",
-          start: {line: 1, column: 1},
           name: "x",
-          end: {line: 1, column: 2}
+          loc: {
+            start: {
+              line: 1,
+              column: 1
+            },
+            end: {
+              line: 1,
+              column: 2
+            }
+          }
         },
-        end: {line: 1, column: 2}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 2
+          }
+        }
       },
-      end: {line: 1, column: 2}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 2
+        }
+      }
     }
   ],
-  end: {line: 1, column: 2}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 2
+    }
+  }
 });
 
 test("-x", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "UnaryExpression",
-        start: {line: 1, column: 0},
         operator: "-",
         prefix: true,
         argument: {
           type: "Identifier",
-          start: {line: 1, column: 1},
           name: "x",
-          end: {line: 1, column: 2}
+          loc: {
+            start: {
+              line: 1,
+              column: 1
+            },
+            end: {
+              line: 1,
+              column: 2
+            }
+          }
         },
-        end: {line: 1, column: 2}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 2
+          }
+        }
       },
-      end: {line: 1, column: 2}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 2
+        }
+      }
     }
   ],
-  end: {line: 1, column: 2}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 2
+    }
+  }
 });
 
 test("~x", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "UnaryExpression",
-        start: {line: 1, column: 0},
         operator: "~",
         prefix: true,
         argument: {
           type: "Identifier",
-          start: {line: 1, column: 1},
           name: "x",
-          end: {line: 1, column: 2}
+          loc: {
+            start: {
+              line: 1,
+              column: 1
+            },
+            end: {
+              line: 1,
+              column: 2
+            }
+          }
         },
-        end: {line: 1, column: 2}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 2
+          }
+        }
       },
-      end: {line: 1, column: 2}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 2
+        }
+      }
     }
   ],
-  end: {line: 1, column: 2}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 2
+    }
+  }
 });
 
 test("!x", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "UnaryExpression",
-        start: {line: 1, column: 0},
         operator: "!",
         prefix: true,
         argument: {
           type: "Identifier",
-          start: {line: 1, column: 1},
           name: "x",
-          end: {line: 1, column: 2}
+          loc: {
+            start: {
+              line: 1,
+              column: 1
+            },
+            end: {
+              line: 1,
+              column: 2
+            }
+          }
         },
-        end: {line: 1, column: 2}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 2
+          }
+        }
       },
-      end: {line: 1, column: 2}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 2
+        }
+      }
     }
   ],
-  end: {line: 1, column: 2}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 2
+    }
+  }
 });
 
 test("void x", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "UnaryExpression",
-        start: {line: 1, column: 0},
         operator: "void",
         prefix: true,
         argument: {
           type: "Identifier",
-          start: {line: 1, column: 5},
           name: "x",
-          end: {line: 1, column: 6}
+          loc: {
+            start: {
+              line: 1,
+              column: 5
+            },
+            end: {
+              line: 1,
+              column: 6
+            }
+          }
         },
-        end: {line: 1, column: 6}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 6
+          }
+        }
       },
-      end: {line: 1, column: 6}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 1, column: 6}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 6
+    }
+  }
 });
 
 test("delete x", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "UnaryExpression",
-        start: {line: 1, column: 0},
         operator: "delete",
         prefix: true,
         argument: {
           type: "Identifier",
-          start: {line: 1, column: 7},
           name: "x",
-          end: {line: 1, column: 8}
+          loc: {
+            start: {
+              line: 1,
+              column: 7
+            },
+            end: {
+              line: 1,
+              column: 8
+            }
+          }
         },
-        end: {line: 1, column: 8}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 8
+          }
+        }
       },
-      end: {line: 1, column: 8}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 8
+        }
+      }
     }
   ],
-  end: {line: 1, column: 8}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 8
+    }
+  }
 });
 
 test("typeof x", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "UnaryExpression",
-        start: {line: 1, column: 0},
         operator: "typeof",
         prefix: true,
         argument: {
           type: "Identifier",
-          start: {line: 1, column: 7},
           name: "x",
-          end: {line: 1, column: 8}
+          loc: {
+            start: {
+              line: 1,
+              column: 7
+            },
+            end: {
+              line: 1,
+              column: 8
+            }
+          }
         },
-        end: {line: 1, column: 8}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 8
+          }
+        }
       },
-      end: {line: 1, column: 8}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 8
+        }
+      }
     }
   ],
-  end: {line: 1, column: 8}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 8
+    }
+  }
 });
 
 test("x * y", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: "*",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 4},
           name: "y",
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
-        end: {line: 1, column: 5}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 5
+          }
+        }
       },
-      end: {line: 1, column: 5}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 5
+        }
+      }
     }
   ],
-  end: {line: 1, column: 5}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 5
+    }
+  }
 });
 
 test("x / y", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: "/",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 4},
           name: "y",
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
-        end: {line: 1, column: 5}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 5
+          }
+        }
       },
-      end: {line: 1, column: 5}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 5
+        }
+      }
     }
   ],
-  end: {line: 1, column: 5}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 5
+    }
+  }
 });
 
 test("x % y", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: "%",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 4},
           name: "y",
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
-        end: {line: 1, column: 5}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 5
+          }
+        }
       },
-      end: {line: 1, column: 5}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 5
+        }
+      }
     }
   ],
-  end: {line: 1, column: 5}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 5
+    }
+  }
 });
 
 test("x + y", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: "+",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 4},
           name: "y",
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
-        end: {line: 1, column: 5}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 5
+          }
+        }
       },
-      end: {line: 1, column: 5}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 5
+        }
+      }
     }
   ],
-  end: {line: 1, column: 5}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 5
+    }
+  }
 });
 
 test("x - y", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: "-",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 4},
           name: "y",
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
-        end: {line: 1, column: 5}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 5
+          }
+        }
       },
-      end: {line: 1, column: 5}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 5
+        }
+      }
     }
   ],
-  end: {line: 1, column: 5}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 5
+    }
+  }
 });
 
 test("x << y", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: "<<",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 5},
           name: "y",
-          end: {line: 1, column: 6}
+          loc: {
+            start: {
+              line: 1,
+              column: 5
+            },
+            end: {
+              line: 1,
+              column: 6
+            }
+          }
         },
-        end: {line: 1, column: 6}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 6
+          }
+        }
       },
-      end: {line: 1, column: 6}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 1, column: 6}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 6
+    }
+  }
 });
 
 test("x >> y", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: ">>",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 5},
           name: "y",
-          end: {line: 1, column: 6}
+          loc: {
+            start: {
+              line: 1,
+              column: 5
+            },
+            end: {
+              line: 1,
+              column: 6
+            }
+          }
         },
-        end: {line: 1, column: 6}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 6
+          }
+        }
       },
-      end: {line: 1, column: 6}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 1, column: 6}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 6
+    }
+  }
 });
 
 test("x >>> y", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: ">>>",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 6},
           name: "y",
-          end: {line: 1, column: 7}
+          loc: {
+            start: {
+              line: 1,
+              column: 6
+            },
+            end: {
+              line: 1,
+              column: 7
+            }
+          }
         },
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
-      end: {line: 1, column: 7}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 7
+        }
+      }
     }
   ],
-  end: {line: 1, column: 7}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 7
+    }
+  }
 });
 
 test("x < y", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: "<",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 4},
           name: "y",
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
-        end: {line: 1, column: 5}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 5
+          }
+        }
       },
-      end: {line: 1, column: 5}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 5
+        }
+      }
     }
   ],
-  end: {line: 1, column: 5}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 5
+    }
+  }
 });
 
 test("x > y", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: ">",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 4},
           name: "y",
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
-        end: {line: 1, column: 5}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 5
+          }
+        }
       },
-      end: {line: 1, column: 5}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 5
+        }
+      }
     }
   ],
-  end: {line: 1, column: 5}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 5
+    }
+  }
 });
 
 test("x <= y", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: "<=",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 5},
           name: "y",
-          end: {line: 1, column: 6}
+          loc: {
+            start: {
+              line: 1,
+              column: 5
+            },
+            end: {
+              line: 1,
+              column: 6
+            }
+          }
         },
-        end: {line: 1, column: 6}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 6
+          }
+        }
       },
-      end: {line: 1, column: 6}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 1, column: 6}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 6
+    }
+  }
 });
 
 test("x >= y", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: ">=",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 5},
           name: "y",
-          end: {line: 1, column: 6}
+          loc: {
+            start: {
+              line: 1,
+              column: 5
+            },
+            end: {
+              line: 1,
+              column: 6
+            }
+          }
         },
-        end: {line: 1, column: 6}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 6
+          }
+        }
       },
-      end: {line: 1, column: 6}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 1, column: 6}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 6
+    }
+  }
 });
 
 test("x in y", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: "in",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 5},
           name: "y",
-          end: {line: 1, column: 6}
+          loc: {
+            start: {
+              line: 1,
+              column: 5
+            },
+            end: {
+              line: 1,
+              column: 6
+            }
+          }
         },
-        end: {line: 1, column: 6}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 6
+          }
+        }
       },
-      end: {line: 1, column: 6}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 1, column: 6}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 6
+    }
+  }
 });
 
 test("x instanceof y", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: "instanceof",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 13},
           name: "y",
-          end: {line: 1, column: 14}
+          loc: {
+            start: {
+              line: 1,
+              column: 13
+            },
+            end: {
+              line: 1,
+              column: 14
+            }
+          }
         },
-        end: {line: 1, column: 14}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 14
+          }
+        }
       },
-      end: {line: 1, column: 14}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 14
+        }
+      }
     }
   ],
-  end: {line: 1, column: 14}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 14
+    }
+  }
 });
 
 test("x < y < z", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "BinaryExpression",
-          start: {line: 1, column: 0},
           left: {
             type: "Identifier",
-            start: {line: 1, column: 0},
             name: "x",
-            end: {line: 1, column: 1}
+            loc: {
+              start: {
+                line: 1,
+                column: 0
+              },
+              end: {
+                line: 1,
+                column: 1
+              }
+            }
           },
           operator: "<",
           right: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "y",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
         operator: "<",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 8},
           name: "z",
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 8
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 9}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 9
+          }
+        }
       },
-      end: {line: 1, column: 9}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 9
+        }
+      }
     }
   ],
-  end: {line: 1, column: 9}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 9
+    }
+  }
 });
 
 test("x == y", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: "==",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 5},
           name: "y",
-          end: {line: 1, column: 6}
+          loc: {
+            start: {
+              line: 1,
+              column: 5
+            },
+            end: {
+              line: 1,
+              column: 6
+            }
+          }
         },
-        end: {line: 1, column: 6}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 6
+          }
+        }
       },
-      end: {line: 1, column: 6}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 1, column: 6}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 6
+    }
+  }
 });
 
 test("x != y", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: "!=",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 5},
           name: "y",
-          end: {line: 1, column: 6}
+          loc: {
+            start: {
+              line: 1,
+              column: 5
+            },
+            end: {
+              line: 1,
+              column: 6
+            }
+          }
         },
-        end: {line: 1, column: 6}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 6
+          }
+        }
       },
-      end: {line: 1, column: 6}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 1, column: 6}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 6
+    }
+  }
 });
 
 test("x === y", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: "===",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 6},
           name: "y",
-          end: {line: 1, column: 7}
+          loc: {
+            start: {
+              line: 1,
+              column: 6
+            },
+            end: {
+              line: 1,
+              column: 7
+            }
+          }
         },
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
-      end: {line: 1, column: 7}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 7
+        }
+      }
     }
   ],
-  end: {line: 1, column: 7}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 7
+    }
+  }
 });
 
 test("x !== y", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: "!==",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 6},
           name: "y",
-          end: {line: 1, column: 7}
+          loc: {
+            start: {
+              line: 1,
+              column: 6
+            },
+            end: {
+              line: 1,
+              column: 7
+            }
+          }
         },
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
-      end: {line: 1, column: 7}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 7
+        }
+      }
     }
   ],
-  end: {line: 1, column: 7}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 7
+    }
+  }
 });
 
 test("x & y", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: "&",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 4},
           name: "y",
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
-        end: {line: 1, column: 5}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 5
+          }
+        }
       },
-      end: {line: 1, column: 5}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 5
+        }
+      }
     }
   ],
-  end: {line: 1, column: 5}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 5
+    }
+  }
 });
 
 test("x ^ y", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: "^",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 4},
           name: "y",
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
-        end: {line: 1, column: 5}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 5
+          }
+        }
       },
-      end: {line: 1, column: 5}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 5
+        }
+      }
     }
   ],
-  end: {line: 1, column: 5}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 5
+    }
+  }
 });
 
 test("x | y", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: "|",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 4},
           name: "y",
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
-        end: {line: 1, column: 5}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 5
+          }
+        }
       },
-      end: {line: 1, column: 5}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 5
+        }
+      }
     }
   ],
-  end: {line: 1, column: 5}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 5
+    }
+  }
 });
 
 test("x + y + z", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "BinaryExpression",
-          start: {line: 1, column: 0},
           left: {
             type: "Identifier",
-            start: {line: 1, column: 0},
             name: "x",
-            end: {line: 1, column: 1}
+            loc: {
+              start: {
+                line: 1,
+                column: 0
+              },
+              end: {
+                line: 1,
+                column: 1
+              }
+            }
           },
           operator: "+",
           right: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "y",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
         operator: "+",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 8},
           name: "z",
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 8
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 9}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 9
+          }
+        }
       },
-      end: {line: 1, column: 9}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 9
+        }
+      }
     }
   ],
-  end: {line: 1, column: 9}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 9
+    }
+  }
 });
 
 test("x - y + z", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "BinaryExpression",
-          start: {line: 1, column: 0},
           left: {
             type: "Identifier",
-            start: {line: 1, column: 0},
             name: "x",
-            end: {line: 1, column: 1}
+            loc: {
+              start: {
+                line: 1,
+                column: 0
+              },
+              end: {
+                line: 1,
+                column: 1
+              }
+            }
           },
           operator: "-",
           right: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "y",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
         operator: "+",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 8},
           name: "z",
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 8
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 9}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 9
+          }
+        }
       },
-      end: {line: 1, column: 9}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 9
+        }
+      }
     }
   ],
-  end: {line: 1, column: 9}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 9
+    }
+  }
 });
 
 test("x + y - z", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "BinaryExpression",
-          start: {line: 1, column: 0},
           left: {
             type: "Identifier",
-            start: {line: 1, column: 0},
             name: "x",
-            end: {line: 1, column: 1}
+            loc: {
+              start: {
+                line: 1,
+                column: 0
+              },
+              end: {
+                line: 1,
+                column: 1
+              }
+            }
           },
           operator: "+",
           right: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "y",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
         operator: "-",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 8},
           name: "z",
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 8
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 9}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 9
+          }
+        }
       },
-      end: {line: 1, column: 9}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 9
+        }
+      }
     }
   ],
-  end: {line: 1, column: 9}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 9
+    }
+  }
 });
 
 test("x - y - z", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "BinaryExpression",
-          start: {line: 1, column: 0},
           left: {
             type: "Identifier",
-            start: {line: 1, column: 0},
             name: "x",
-            end: {line: 1, column: 1}
+            loc: {
+              start: {
+                line: 1,
+                column: 0
+              },
+              end: {
+                line: 1,
+                column: 1
+              }
+            }
           },
           operator: "-",
           right: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "y",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
         operator: "-",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 8},
           name: "z",
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 8
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 9}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 9
+          }
+        }
       },
-      end: {line: 1, column: 9}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 9
+        }
+      }
     }
   ],
-  end: {line: 1, column: 9}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 9
+    }
+  }
 });
 
 test("x + y * z", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: "+",
         right: {
           type: "BinaryExpression",
-          start: {line: 1, column: 4},
           left: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "y",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
           operator: "*",
           right: {
             type: "Identifier",
-            start: {line: 1, column: 8},
             name: "z",
-            end: {line: 1, column: 9}
+            loc: {
+              start: {
+                line: 1,
+                column: 8
+              },
+              end: {
+                line: 1,
+                column: 9
+              }
+            }
           },
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 9}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 9
+          }
+        }
       },
-      end: {line: 1, column: 9}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 9
+        }
+      }
     }
   ],
-  end: {line: 1, column: 9}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 9
+    }
+  }
 });
 
 test("x + y / z", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: "+",
         right: {
           type: "BinaryExpression",
-          start: {line: 1, column: 4},
           left: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "y",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
           operator: "/",
           right: {
             type: "Identifier",
-            start: {line: 1, column: 8},
             name: "z",
-            end: {line: 1, column: 9}
+            loc: {
+              start: {
+                line: 1,
+                column: 8
+              },
+              end: {
+                line: 1,
+                column: 9
+              }
+            }
           },
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 9}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 9
+          }
+        }
       },
-      end: {line: 1, column: 9}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 9
+        }
+      }
     }
   ],
-  end: {line: 1, column: 9}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 9
+    }
+  }
 });
 
 test("x - y % z", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: "-",
         right: {
           type: "BinaryExpression",
-          start: {line: 1, column: 4},
           left: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "y",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
           operator: "%",
           right: {
             type: "Identifier",
-            start: {line: 1, column: 8},
             name: "z",
-            end: {line: 1, column: 9}
+            loc: {
+              start: {
+                line: 1,
+                column: 8
+              },
+              end: {
+                line: 1,
+                column: 9
+              }
+            }
           },
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 9}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 9
+          }
+        }
       },
-      end: {line: 1, column: 9}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 9
+        }
+      }
     }
   ],
-  end: {line: 1, column: 9}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 9
+    }
+  }
 });
 
 test("x * y * z", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "BinaryExpression",
-          start: {line: 1, column: 0},
           left: {
             type: "Identifier",
-            start: {line: 1, column: 0},
             name: "x",
-            end: {line: 1, column: 1}
+            loc: {
+              start: {
+                line: 1,
+                column: 0
+              },
+              end: {
+                line: 1,
+                column: 1
+              }
+            }
           },
           operator: "*",
           right: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "y",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
         operator: "*",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 8},
           name: "z",
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 8
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 9}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 9
+          }
+        }
       },
-      end: {line: 1, column: 9}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 9
+        }
+      }
     }
   ],
-  end: {line: 1, column: 9}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 9
+    }
+  }
 });
 
 test("x * y / z", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "BinaryExpression",
-          start: {line: 1, column: 0},
           left: {
             type: "Identifier",
-            start: {line: 1, column: 0},
             name: "x",
-            end: {line: 1, column: 1}
+            loc: {
+              start: {
+                line: 1,
+                column: 0
+              },
+              end: {
+                line: 1,
+                column: 1
+              }
+            }
           },
           operator: "*",
           right: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "y",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
         operator: "/",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 8},
           name: "z",
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 8
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 9}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 9
+          }
+        }
       },
-      end: {line: 1, column: 9}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 9
+        }
+      }
     }
   ],
-  end: {line: 1, column: 9}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 9
+    }
+  }
 });
 
 test("x * y % z", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "BinaryExpression",
-          start: {line: 1, column: 0},
           left: {
             type: "Identifier",
-            start: {line: 1, column: 0},
             name: "x",
-            end: {line: 1, column: 1}
+            loc: {
+              start: {
+                line: 1,
+                column: 0
+              },
+              end: {
+                line: 1,
+                column: 1
+              }
+            }
           },
           operator: "*",
           right: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "y",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
         operator: "%",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 8},
           name: "z",
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 8
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 9}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 9
+          }
+        }
       },
-      end: {line: 1, column: 9}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 9
+        }
+      }
     }
   ],
-  end: {line: 1, column: 9}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 9
+    }
+  }
 });
 
 test("x % y * z", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "BinaryExpression",
-          start: {line: 1, column: 0},
           left: {
             type: "Identifier",
-            start: {line: 1, column: 0},
             name: "x",
-            end: {line: 1, column: 1}
+            loc: {
+              start: {
+                line: 1,
+                column: 0
+              },
+              end: {
+                line: 1,
+                column: 1
+              }
+            }
           },
           operator: "%",
           right: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "y",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
         operator: "*",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 8},
           name: "z",
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 8
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 9}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 9
+          }
+        }
       },
-      end: {line: 1, column: 9}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 9
+        }
+      }
     }
   ],
-  end: {line: 1, column: 9}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 9
+    }
+  }
 });
 
 test("x << y << z", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "BinaryExpression",
-          start: {line: 1, column: 0},
           left: {
             type: "Identifier",
-            start: {line: 1, column: 0},
             name: "x",
-            end: {line: 1, column: 1}
+            loc: {
+              start: {
+                line: 1,
+                column: 0
+              },
+              end: {
+                line: 1,
+                column: 1
+              }
+            }
           },
           operator: "<<",
           right: {
             type: "Identifier",
-            start: {line: 1, column: 5},
             name: "y",
-            end: {line: 1, column: 6}
+            loc: {
+              start: {
+                line: 1,
+                column: 5
+              },
+              end: {
+                line: 1,
+                column: 6
+              }
+            }
           },
-          end: {line: 1, column: 6}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 6
+            }
+          }
         },
         operator: "<<",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 10},
           name: "z",
-          end: {line: 1, column: 11}
+          loc: {
+            start: {
+              line: 1,
+              column: 10
+            },
+            end: {
+              line: 1,
+              column: 11
+            }
+          }
         },
-        end: {line: 1, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 11
+          }
+        }
       },
-      end: {line: 1, column: 11}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 11
+        }
+      }
     }
   ],
-  end: {line: 1, column: 11}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 11
+    }
+  }
 });
 
 test("x | y | z", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "BinaryExpression",
-          start: {line: 1, column: 0},
           left: {
             type: "Identifier",
-            start: {line: 1, column: 0},
             name: "x",
-            end: {line: 1, column: 1}
+            loc: {
+              start: {
+                line: 1,
+                column: 0
+              },
+              end: {
+                line: 1,
+                column: 1
+              }
+            }
           },
           operator: "|",
           right: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "y",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
         operator: "|",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 8},
           name: "z",
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 8
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 9}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 9
+          }
+        }
       },
-      end: {line: 1, column: 9}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 9
+        }
+      }
     }
   ],
-  end: {line: 1, column: 9}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 9
+    }
+  }
 });
 
 test("x & y & z", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "BinaryExpression",
-          start: {line: 1, column: 0},
           left: {
             type: "Identifier",
-            start: {line: 1, column: 0},
             name: "x",
-            end: {line: 1, column: 1}
+            loc: {
+              start: {
+                line: 1,
+                column: 0
+              },
+              end: {
+                line: 1,
+                column: 1
+              }
+            }
           },
           operator: "&",
           right: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "y",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
         operator: "&",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 8},
           name: "z",
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 8
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 9}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 9
+          }
+        }
       },
-      end: {line: 1, column: 9}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 9
+        }
+      }
     }
   ],
-  end: {line: 1, column: 9}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 9
+    }
+  }
 });
 
 test("x ^ y ^ z", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "BinaryExpression",
-          start: {line: 1, column: 0},
           left: {
             type: "Identifier",
-            start: {line: 1, column: 0},
             name: "x",
-            end: {line: 1, column: 1}
+            loc: {
+              start: {
+                line: 1,
+                column: 0
+              },
+              end: {
+                line: 1,
+                column: 1
+              }
+            }
           },
           operator: "^",
           right: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "y",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
         operator: "^",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 8},
           name: "z",
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 8
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 9}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 9
+          }
+        }
       },
-      end: {line: 1, column: 9}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 9
+        }
+      }
     }
   ],
-  end: {line: 1, column: 9}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 9
+    }
+  }
 });
 
 test("x & y | z", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "BinaryExpression",
-          start: {line: 1, column: 0},
           left: {
             type: "Identifier",
-            start: {line: 1, column: 0},
             name: "x",
-            end: {line: 1, column: 1}
+            loc: {
+              start: {
+                line: 1,
+                column: 0
+              },
+              end: {
+                line: 1,
+                column: 1
+              }
+            }
           },
           operator: "&",
           right: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "y",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
         operator: "|",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 8},
           name: "z",
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 8
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 9}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 9
+          }
+        }
       },
-      end: {line: 1, column: 9}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 9
+        }
+      }
     }
   ],
-  end: {line: 1, column: 9}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 9
+    }
+  }
 });
 
 test("x | y ^ z", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: "|",
         right: {
           type: "BinaryExpression",
-          start: {line: 1, column: 4},
           left: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "y",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
           operator: "^",
           right: {
             type: "Identifier",
-            start: {line: 1, column: 8},
             name: "z",
-            end: {line: 1, column: 9}
+            loc: {
+              start: {
+                line: 1,
+                column: 8
+              },
+              end: {
+                line: 1,
+                column: 9
+              }
+            }
           },
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 9}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 9
+          }
+        }
       },
-      end: {line: 1, column: 9}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 9
+        }
+      }
     }
   ],
-  end: {line: 1, column: 9}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 9
+    }
+  }
 });
 
 test("x | y & z", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "BinaryExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: "|",
         right: {
           type: "BinaryExpression",
-          start: {line: 1, column: 4},
           left: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "y",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
           operator: "&",
           right: {
             type: "Identifier",
-            start: {line: 1, column: 8},
             name: "z",
-            end: {line: 1, column: 9}
+            loc: {
+              start: {
+                line: 1,
+                column: 8
+              },
+              end: {
+                line: 1,
+                column: 9
+              }
+            }
           },
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 9}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 9
+          }
+        }
       },
-      end: {line: 1, column: 9}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 9
+        }
+      }
     }
   ],
-  end: {line: 1, column: 9}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 9
+    }
+  }
 });
 
 test("x || y", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "LogicalExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: "||",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 5},
           name: "y",
-          end: {line: 1, column: 6}
+          loc: {
+            start: {
+              line: 1,
+              column: 5
+            },
+            end: {
+              line: 1,
+              column: 6
+            }
+          }
         },
-        end: {line: 1, column: 6}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 6
+          }
+        }
       },
-      end: {line: 1, column: 6}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 1, column: 6}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 6
+    }
+  }
 });
 
 test("x && y", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "LogicalExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: "&&",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 5},
           name: "y",
-          end: {line: 1, column: 6}
+          loc: {
+            start: {
+              line: 1,
+              column: 5
+            },
+            end: {
+              line: 1,
+              column: 6
+            }
+          }
         },
-        end: {line: 1, column: 6}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 6
+          }
+        }
       },
-      end: {line: 1, column: 6}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 1, column: 6}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 6
+    }
+  }
 });
 
 test("x || y || z", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "LogicalExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "LogicalExpression",
-          start: {line: 1, column: 0},
           left: {
             type: "Identifier",
-            start: {line: 1, column: 0},
             name: "x",
-            end: {line: 1, column: 1}
+            loc: {
+              start: {
+                line: 1,
+                column: 0
+              },
+              end: {
+                line: 1,
+                column: 1
+              }
+            }
           },
           operator: "||",
           right: {
             type: "Identifier",
-            start: {line: 1, column: 5},
             name: "y",
-            end: {line: 1, column: 6}
+            loc: {
+              start: {
+                line: 1,
+                column: 5
+              },
+              end: {
+                line: 1,
+                column: 6
+              }
+            }
           },
-          end: {line: 1, column: 6}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 6
+            }
+          }
         },
         operator: "||",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 10},
           name: "z",
-          end: {line: 1, column: 11}
+          loc: {
+            start: {
+              line: 1,
+              column: 10
+            },
+            end: {
+              line: 1,
+              column: 11
+            }
+          }
         },
-        end: {line: 1, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 11
+          }
+        }
       },
-      end: {line: 1, column: 11}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 11
+        }
+      }
     }
   ],
-  end: {line: 1, column: 11}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 11
+    }
+  }
 });
 
 test("x && y && z", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "LogicalExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "LogicalExpression",
-          start: {line: 1, column: 0},
           left: {
             type: "Identifier",
-            start: {line: 1, column: 0},
             name: "x",
-            end: {line: 1, column: 1}
+            loc: {
+              start: {
+                line: 1,
+                column: 0
+              },
+              end: {
+                line: 1,
+                column: 1
+              }
+            }
           },
           operator: "&&",
           right: {
             type: "Identifier",
-            start: {line: 1, column: 5},
             name: "y",
-            end: {line: 1, column: 6}
+            loc: {
+              start: {
+                line: 1,
+                column: 5
+              },
+              end: {
+                line: 1,
+                column: 6
+              }
+            }
           },
-          end: {line: 1, column: 6}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 6
+            }
+          }
         },
         operator: "&&",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 10},
           name: "z",
-          end: {line: 1, column: 11}
+          loc: {
+            start: {
+              line: 1,
+              column: 10
+            },
+            end: {
+              line: 1,
+              column: 11
+            }
+          }
         },
-        end: {line: 1, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 11
+          }
+        }
       },
-      end: {line: 1, column: 11}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 11
+        }
+      }
     }
   ],
-  end: {line: 1, column: 11}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 11
+    }
+  }
 });
 
 test("x || y && z", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "LogicalExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: "||",
         right: {
           type: "LogicalExpression",
-          start: {line: 1, column: 5},
           left: {
             type: "Identifier",
-            start: {line: 1, column: 5},
             name: "y",
-            end: {line: 1, column: 6}
+            loc: {
+              start: {
+                line: 1,
+                column: 5
+              },
+              end: {
+                line: 1,
+                column: 6
+              }
+            }
           },
           operator: "&&",
           right: {
             type: "Identifier",
-            start: {line: 1, column: 10},
             name: "z",
-            end: {line: 1, column: 11}
+            loc: {
+              start: {
+                line: 1,
+                column: 10
+              },
+              end: {
+                line: 1,
+                column: 11
+              }
+            }
           },
-          end: {line: 1, column: 11}
+          loc: {
+            start: {
+              line: 1,
+              column: 5
+            },
+            end: {
+              line: 1,
+              column: 11
+            }
+          }
         },
-        end: {line: 1, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 11
+          }
+        }
       },
-      end: {line: 1, column: 11}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 11
+        }
+      }
     }
   ],
-  end: {line: 1, column: 11}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 11
+    }
+  }
 });
 
 test("x || y ^ z", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "LogicalExpression",
-        start: {line: 1, column: 0},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         operator: "||",
         right: {
           type: "BinaryExpression",
-          start: {line: 1, column: 5},
           left: {
             type: "Identifier",
-            start: {line: 1, column: 5},
             name: "y",
-            end: {line: 1, column: 6}
+            loc: {
+              start: {
+                line: 1,
+                column: 5
+              },
+              end: {
+                line: 1,
+                column: 6
+              }
+            }
           },
           operator: "^",
           right: {
             type: "Identifier",
-            start: {line: 1, column: 9},
             name: "z",
-            end: {line: 1, column: 10}
+            loc: {
+              start: {
+                line: 1,
+                column: 9
+              },
+              end: {
+                line: 1,
+                column: 10
+              }
+            }
           },
-          end: {line: 1, column: 10}
+          loc: {
+            start: {
+              line: 1,
+              column: 5
+            },
+            end: {
+              line: 1,
+              column: 10
+            }
+          }
         },
-        end: {line: 1, column: 10}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 10
+          }
+        }
       },
-      end: {line: 1, column: 10}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 10
+        }
+      }
     }
   ],
-  end: {line: 1, column: 10}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 10
+    }
+  }
 });
 
 test("y ? 1 : 2", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "ConditionalExpression",
-        start: {line: 1, column: 0},
         test: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "y",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         consequent: {
           type: "Literal",
-          start: {line: 1, column: 4},
           value: 1,
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
         alternate: {
           type: "Literal",
-          start: {line: 1, column: 8},
           value: 2,
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 8
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 9}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 9
+          }
+        }
       },
-      end: {line: 1, column: 9}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 9
+        }
+      }
     }
   ],
-  end: {line: 1, column: 9}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 9
+    }
+  }
 });
 
 test("x && y ? 1 : 2", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "ConditionalExpression",
-        start: {line: 1, column: 0},
         test: {
           type: "LogicalExpression",
-          start: {line: 1, column: 0},
           left: {
             type: "Identifier",
-            start: {line: 1, column: 0},
             name: "x",
-            end: {line: 1, column: 1}
+            loc: {
+              start: {
+                line: 1,
+                column: 0
+              },
+              end: {
+                line: 1,
+                column: 1
+              }
+            }
           },
           operator: "&&",
           right: {
             type: "Identifier",
-            start: {line: 1, column: 5},
             name: "y",
-            end: {line: 1, column: 6}
+            loc: {
+              start: {
+                line: 1,
+                column: 5
+              },
+              end: {
+                line: 1,
+                column: 6
+              }
+            }
           },
-          end: {line: 1, column: 6}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 6
+            }
+          }
         },
         consequent: {
           type: "Literal",
-          start: {line: 1, column: 9},
           value: 1,
-          end: {line: 1, column: 10}
+          loc: {
+            start: {
+              line: 1,
+              column: 9
+            },
+            end: {
+              line: 1,
+              column: 10
+            }
+          }
         },
         alternate: {
           type: "Literal",
-          start: {line: 1, column: 13},
           value: 2,
-          end: {line: 1, column: 14}
+          loc: {
+            start: {
+              line: 1,
+              column: 13
+            },
+            end: {
+              line: 1,
+              column: 14
+            }
+          }
         },
-        end: {line: 1, column: 14}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 14
+          }
+        }
       },
-      end: {line: 1, column: 14}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 14
+        }
+      }
     }
   ],
-  end: {line: 1, column: 14}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 14
+    }
+  }
 });
 
 test("x = 42", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "Literal",
-          start: {line: 1, column: 4},
           value: 42,
-          end: {line: 1, column: 6}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 6
+            }
+          }
         },
-        end: {line: 1, column: 6}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 6
+          }
+        }
       },
-      end: {line: 1, column: 6}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 1, column: 6}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 6
+    }
+  }
 });
 
 test("eval = 42", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "eval",
-          end: {line: 1, column: 4}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 4
+            }
+          }
         },
         right: {
           type: "Literal",
-          start: {line: 1, column: 7},
           value: 42,
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 7
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 9}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 9
+          }
+        }
       },
-      end: {line: 1, column: 9}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 9
+        }
+      }
     }
   ],
-  end: {line: 1, column: 9}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 9
+    }
+  }
 });
 
 test("arguments = 42", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "arguments",
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
         right: {
           type: "Literal",
-          start: {line: 1, column: 12},
           value: 42,
-          end: {line: 1, column: 14}
+          loc: {
+            start: {
+              line: 1,
+              column: 12
+            },
+            end: {
+              line: 1,
+              column: 14
+            }
+          }
         },
-        end: {line: 1, column: 14}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 14
+          }
+        }
       },
-      end: {line: 1, column: 14}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 14
+        }
+      }
     }
   ],
-  end: {line: 1, column: 14}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 14
+    }
+  }
 });
 
 test("x *= 42", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "*=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "Literal",
-          start: {line: 1, column: 5},
           value: 42,
-          end: {line: 1, column: 7}
+          loc: {
+            start: {
+              line: 1,
+              column: 5
+            },
+            end: {
+              line: 1,
+              column: 7
+            }
+          }
         },
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
-      end: {line: 1, column: 7}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 7
+        }
+      }
     }
   ],
-  end: {line: 1, column: 7}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 7
+    }
+  }
 });
 
 test("x /= 42", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "/=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "Literal",
-          start: {line: 1, column: 5},
           value: 42,
-          end: {line: 1, column: 7}
+          loc: {
+            start: {
+              line: 1,
+              column: 5
+            },
+            end: {
+              line: 1,
+              column: 7
+            }
+          }
         },
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
-      end: {line: 1, column: 7}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 7
+        }
+      }
     }
   ],
-  end: {line: 1, column: 7}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 7
+    }
+  }
 });
 
 test("x %= 42", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "%=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "Literal",
-          start: {line: 1, column: 5},
           value: 42,
-          end: {line: 1, column: 7}
+          loc: {
+            start: {
+              line: 1,
+              column: 5
+            },
+            end: {
+              line: 1,
+              column: 7
+            }
+          }
         },
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
-      end: {line: 1, column: 7}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 7
+        }
+      }
     }
   ],
-  end: {line: 1, column: 7}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 7
+    }
+  }
 });
 
 test("x += 42", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "+=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "Literal",
-          start: {line: 1, column: 5},
           value: 42,
-          end: {line: 1, column: 7}
+          loc: {
+            start: {
+              line: 1,
+              column: 5
+            },
+            end: {
+              line: 1,
+              column: 7
+            }
+          }
         },
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
-      end: {line: 1, column: 7}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 7
+        }
+      }
     }
   ],
-  end: {line: 1, column: 7}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 7
+    }
+  }
 });
 
 test("x -= 42", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "-=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "Literal",
-          start: {line: 1, column: 5},
           value: 42,
-          end: {line: 1, column: 7}
+          loc: {
+            start: {
+              line: 1,
+              column: 5
+            },
+            end: {
+              line: 1,
+              column: 7
+            }
+          }
         },
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
-      end: {line: 1, column: 7}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 7
+        }
+      }
     }
   ],
-  end: {line: 1, column: 7}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 7
+    }
+  }
 });
 
 test("x <<= 42", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "<<=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "Literal",
-          start: {line: 1, column: 6},
           value: 42,
-          end: {line: 1, column: 8}
+          loc: {
+            start: {
+              line: 1,
+              column: 6
+            },
+            end: {
+              line: 1,
+              column: 8
+            }
+          }
         },
-        end: {line: 1, column: 8}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 8
+          }
+        }
       },
-      end: {line: 1, column: 8}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 8
+        }
+      }
     }
   ],
-  end: {line: 1, column: 8}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 8
+    }
+  }
 });
 
 test("x >>= 42", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: ">>=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "Literal",
-          start: {line: 1, column: 6},
           value: 42,
-          end: {line: 1, column: 8}
+          loc: {
+            start: {
+              line: 1,
+              column: 6
+            },
+            end: {
+              line: 1,
+              column: 8
+            }
+          }
         },
-        end: {line: 1, column: 8}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 8
+          }
+        }
       },
-      end: {line: 1, column: 8}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 8
+        }
+      }
     }
   ],
-  end: {line: 1, column: 8}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 8
+    }
+  }
 });
 
 test("x >>>= 42", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: ">>>=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "Literal",
-          start: {line: 1, column: 7},
           value: 42,
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 7
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 9}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 9
+          }
+        }
       },
-      end: {line: 1, column: 9}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 9
+        }
+      }
     }
   ],
-  end: {line: 1, column: 9}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 9
+    }
+  }
 });
 
 test("x &= 42", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "&=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "Literal",
-          start: {line: 1, column: 5},
           value: 42,
-          end: {line: 1, column: 7}
+          loc: {
+            start: {
+              line: 1,
+              column: 5
+            },
+            end: {
+              line: 1,
+              column: 7
+            }
+          }
         },
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
-      end: {line: 1, column: 7}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 7
+        }
+      }
     }
   ],
-  end: {line: 1, column: 7}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 7
+    }
+  }
 });
 
 test("x ^= 42", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "^=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "Literal",
-          start: {line: 1, column: 5},
           value: 42,
-          end: {line: 1, column: 7}
+          loc: {
+            start: {
+              line: 1,
+              column: 5
+            },
+            end: {
+              line: 1,
+              column: 7
+            }
+          }
         },
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
-      end: {line: 1, column: 7}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 7
+        }
+      }
     }
   ],
-  end: {line: 1, column: 7}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 7
+    }
+  }
 });
 
 test("x |= 42", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 0},
         operator: "|=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 0},
           name: "x",
-          end: {line: 1, column: 1}
+          loc: {
+            start: {
+              line: 1,
+              column: 0
+            },
+            end: {
+              line: 1,
+              column: 1
+            }
+          }
         },
         right: {
           type: "Literal",
-          start: {line: 1, column: 5},
           value: 42,
-          end: {line: 1, column: 7}
+          loc: {
+            start: {
+              line: 1,
+              column: 5
+            },
+            end: {
+              line: 1,
+              column: 7
+            }
+          }
         },
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
-      end: {line: 1, column: 7}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 7
+        }
+      }
     }
   ],
-  end: {line: 1, column: 7}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 7
+    }
+  }
 });
 
 test("{ foo }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "BlockStatement",
-      start: {line: 1, column: 0},
       body: [
         {
           type: "ExpressionStatement",
-          start: {line: 1, column: 2},
           expression: {
             type: "Identifier",
-            start: {line: 1, column: 2},
             name: "foo",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 2
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 2
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         }
       ],
-      end: {line: 1, column: 7}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 7
+        }
+      }
     }
   ],
-  end: {line: 1, column: 7}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 7
+    }
+  }
 });
 
 test("{ doThis(); doThat(); }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "BlockStatement",
-      start: {line: 1, column: 0},
       body: [
         {
           type: "ExpressionStatement",
-          start: {line: 1, column: 2},
           expression: {
             type: "CallExpression",
-            start: {line: 1, column: 2},
             callee: {
               type: "Identifier",
-              start: {line: 1, column: 2},
               name: "doThis",
-              end: {line: 1, column: 8}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 2
+                },
+                end: {
+                  line: 1,
+                  column: 8
+                }
+              }
             },
             arguments: [],
-            end: {line: 1, column: 10}
+            loc: {
+              start: {
+                line: 1,
+                column: 2
+              },
+              end: {
+                line: 1,
+                column: 10
+              }
+            }
           },
-          end: {line: 1, column: 11}
+          loc: {
+            start: {
+              line: 1,
+              column: 2
+            },
+            end: {
+              line: 1,
+              column: 11
+            }
+          }
         },
         {
           type: "ExpressionStatement",
-          start: {line: 1, column: 12},
           expression: {
             type: "CallExpression",
-            start: {line: 1, column: 12},
             callee: {
               type: "Identifier",
-              start: {line: 1, column: 12},
               name: "doThat",
-              end: {line: 1, column: 18}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 12
+                },
+                end: {
+                  line: 1,
+                  column: 18
+                }
+              }
             },
             arguments: [],
-            end: {line: 1, column: 20}
+            loc: {
+              start: {
+                line: 1,
+                column: 12
+              },
+              end: {
+                line: 1,
+                column: 20
+              }
+            }
           },
-          end: {line: 1, column: 21}
+          loc: {
+            start: {
+              line: 1,
+              column: 12
+            },
+            end: {
+              line: 1,
+              column: 21
+            }
+          }
         }
       ],
-      end: {line: 1, column: 23}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 23
+        }
+      }
     }
   ],
-  end: {line: 1, column: 23}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 23
+    }
+  }
 });
 
 test("{}", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "BlockStatement",
-      start: {line: 1, column: 0},
       body: [],
-      end: {line: 1, column: 2}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 2
+        }
+      }
     }
   ],
-  end: {line: 1, column: 2}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 2
+    }
+  }
 });
 
 test("var x", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "VariableDeclaration",
-      start: {line: 1, column: 0},
       declarations: [
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 4},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "x",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
           init: null,
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         }
       ],
       kind: "var",
-      end: {line: 1, column: 5}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 5
+        }
+      }
     }
   ],
-  end: {line: 1, column: 5}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 5
+    }
+  }
 });
 
 test("var x, y;", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "VariableDeclaration",
-      start: {line: 1, column: 0},
       declarations: [
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 4},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "x",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
           init: null,
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 7},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 7},
             name: "y",
-            end: {line: 1, column: 8}
+            loc: {
+              start: {
+                line: 1,
+                column: 7
+              },
+              end: {
+                line: 1,
+                column: 8
+              }
+            }
           },
           init: null,
-          end: {line: 1, column: 8}
+          loc: {
+            start: {
+              line: 1,
+              column: 7
+            },
+            end: {
+              line: 1,
+              column: 8
+            }
+          }
         }
       ],
       kind: "var",
-      end: {line: 1, column: 8}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 8
+        }
+      }
     }
   ],
-  end: {line: 1, column: 9}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 9
+    }
+  }
 });
 
 test("var x = 42", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "VariableDeclaration",
-      start: {line: 1, column: 0},
       declarations: [
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 4},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "x",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
           init: {
             type: "Literal",
-            start: {line: 1, column: 8},
             value: 42,
-            end: {line: 1, column: 10}
+            loc: {
+              start: {
+                line: 1,
+                column: 8
+              },
+              end: {
+                line: 1,
+                column: 10
+              }
+            }
           },
-          end: {line: 1, column: 10}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 10
+            }
+          }
         }
       ],
       kind: "var",
-      end: {line: 1, column: 10}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 10
+        }
+      }
     }
   ],
-  end: {line: 1, column: 10}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 10
+    }
+  }
 });
 
 test("var eval = 42, arguments = 42", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "VariableDeclaration",
-      start: {line: 1, column: 0},
       declarations: [
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 4},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "eval",
-            end: {line: 1, column: 8}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 8
+              }
+            }
           },
           init: {
             type: "Literal",
-            start: {line: 1, column: 11},
             value: 42,
-            end: {line: 1, column: 13}
+            loc: {
+              start: {
+                line: 1,
+                column: 11
+              },
+              end: {
+                line: 1,
+                column: 13
+              }
+            }
           },
-          end: {line: 1, column: 13}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 13
+            }
+          }
         },
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 15},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 15},
             name: "arguments",
-            end: {line: 1, column: 24}
+            loc: {
+              start: {
+                line: 1,
+                column: 15
+              },
+              end: {
+                line: 1,
+                column: 24
+              }
+            }
           },
           init: {
             type: "Literal",
-            start: {line: 1, column: 27},
             value: 42,
-            end: {line: 1, column: 29}
+            loc: {
+              start: {
+                line: 1,
+                column: 27
+              },
+              end: {
+                line: 1,
+                column: 29
+              }
+            }
           },
-          end: {line: 1, column: 29}
+          loc: {
+            start: {
+              line: 1,
+              column: 15
+            },
+            end: {
+              line: 1,
+              column: 29
+            }
+          }
         }
       ],
       kind: "var",
-      end: {line: 1, column: 29}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 29
+        }
+      }
     }
   ],
-  end: {line: 1, column: 29}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 29
+    }
+  }
 });
 
 test("var x = 14, y = 3, z = 1977", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "VariableDeclaration",
-      start: {line: 1, column: 0},
       declarations: [
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 4},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "x",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
           init: {
             type: "Literal",
-            start: {line: 1, column: 8},
             value: 14,
-            end: {line: 1, column: 10}
+            loc: {
+              start: {
+                line: 1,
+                column: 8
+              },
+              end: {
+                line: 1,
+                column: 10
+              }
+            }
           },
-          end: {line: 1, column: 10}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 10
+            }
+          }
         },
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 12},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 12},
             name: "y",
-            end: {line: 1, column: 13}
+            loc: {
+              start: {
+                line: 1,
+                column: 12
+              },
+              end: {
+                line: 1,
+                column: 13
+              }
+            }
           },
           init: {
             type: "Literal",
-            start: {line: 1, column: 16},
             value: 3,
-            end: {line: 1, column: 17}
+            loc: {
+              start: {
+                line: 1,
+                column: 16
+              },
+              end: {
+                line: 1,
+                column: 17
+              }
+            }
           },
-          end: {line: 1, column: 17}
+          loc: {
+            start: {
+              line: 1,
+              column: 12
+            },
+            end: {
+              line: 1,
+              column: 17
+            }
+          }
         },
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 19},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 19},
             name: "z",
-            end: {line: 1, column: 20}
+            loc: {
+              start: {
+                line: 1,
+                column: 19
+              },
+              end: {
+                line: 1,
+                column: 20
+              }
+            }
           },
           init: {
             type: "Literal",
-            start: {line: 1, column: 23},
             value: 1977,
-            end: {line: 1, column: 27}
+            loc: {
+              start: {
+                line: 1,
+                column: 23
+              },
+              end: {
+                line: 1,
+                column: 27
+              }
+            }
           },
-          end: {line: 1, column: 27}
+          loc: {
+            start: {
+              line: 1,
+              column: 19
+            },
+            end: {
+              line: 1,
+              column: 27
+            }
+          }
         }
       ],
       kind: "var",
-      end: {line: 1, column: 27}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 27
+        }
+      }
     }
   ],
-  end: {line: 1, column: 27}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 27
+    }
+  }
 });
 
 test("var implements, interface, package", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "VariableDeclaration",
-      start: {line: 1, column: 0},
       declarations: [
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 4},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "implements",
-            end: {line: 1, column: 14}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 14
+              }
+            }
           },
           init: null,
-          end: {line: 1, column: 14}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 14
+            }
+          }
         },
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 16},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 16},
             name: "interface",
-            end: {line: 1, column: 25}
+            loc: {
+              start: {
+                line: 1,
+                column: 16
+              },
+              end: {
+                line: 1,
+                column: 25
+              }
+            }
           },
           init: null,
-          end: {line: 1, column: 25}
+          loc: {
+            start: {
+              line: 1,
+              column: 16
+            },
+            end: {
+              line: 1,
+              column: 25
+            }
+          }
         },
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 27},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 27},
             name: "package",
-            end: {line: 1, column: 34}
+            loc: {
+              start: {
+                line: 1,
+                column: 27
+              },
+              end: {
+                line: 1,
+                column: 34
+              }
+            }
           },
           init: null,
-          end: {line: 1, column: 34}
+          loc: {
+            start: {
+              line: 1,
+              column: 27
+            },
+            end: {
+              line: 1,
+              column: 34
+            }
+          }
         }
       ],
       kind: "var",
-      end: {line: 1, column: 34}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 34
+        }
+      }
     }
   ],
-  end: {line: 1, column: 34}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 34
+    }
+  }
 });
 
 test("var private, protected, public, static", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "VariableDeclaration",
-      start: {line: 1, column: 0},
       declarations: [
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 4},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "private",
-            end: {line: 1, column: 11}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 11
+              }
+            }
           },
           init: null,
-          end: {line: 1, column: 11}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 11
+            }
+          }
         },
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 13},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 13},
             name: "protected",
-            end: {line: 1, column: 22}
+            loc: {
+              start: {
+                line: 1,
+                column: 13
+              },
+              end: {
+                line: 1,
+                column: 22
+              }
+            }
           },
           init: null,
-          end: {line: 1, column: 22}
+          loc: {
+            start: {
+              line: 1,
+              column: 13
+            },
+            end: {
+              line: 1,
+              column: 22
+            }
+          }
         },
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 24},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 24},
             name: "public",
-            end: {line: 1, column: 30}
+            loc: {
+              start: {
+                line: 1,
+                column: 24
+              },
+              end: {
+                line: 1,
+                column: 30
+              }
+            }
           },
           init: null,
-          end: {line: 1, column: 30}
+          loc: {
+            start: {
+              line: 1,
+              column: 24
+            },
+            end: {
+              line: 1,
+              column: 30
+            }
+          }
         },
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 32},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 32},
             name: "static",
-            end: {line: 1, column: 38}
+            loc: {
+              start: {
+                line: 1,
+                column: 32
+              },
+              end: {
+                line: 1,
+                column: 38
+              }
+            }
           },
           init: null,
-          end: {line: 1, column: 38}
+          loc: {
+            start: {
+              line: 1,
+              column: 32
+            },
+            end: {
+              line: 1,
+              column: 38
+            }
+          }
         }
       ],
       kind: "var",
-      end: {line: 1, column: 38}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 38
+        }
+      }
     }
   ],
-  end: {line: 1, column: 38}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 38
+    }
+  }
 });
 
 test(";", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "EmptyStatement",
-      start: {line: 1, column: 0},
-      end: {line: 1, column: 1}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 1
+        }
+      }
     }
   ],
-  end: {line: 1, column: 1}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 1
+    }
+  }
 });
 
 test("x", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Identifier",
-        start: {line: 1, column: 0},
         name: "x",
-        end: {line: 1, column: 1}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 1
+          }
+        }
       },
-      end: {line: 1, column: 1}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 1
+        }
+      }
     }
   ],
-  end: {line: 1, column: 1}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 1
+    }
+  }
 });
 
 test("x, y", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "SequenceExpression",
-        start: {line: 1, column: 0},
         expressions: [
           {
             type: "Identifier",
-            start: {line: 1, column: 0},
             name: "x",
-            end: {line: 1, column: 1}
+            loc: {
+              start: {
+                line: 1,
+                column: 0
+              },
+              end: {
+                line: 1,
+                column: 1
+              }
+            }
           },
           {
             type: "Identifier",
-            start: {line: 1, column: 3},
             name: "y",
-            end: {line: 1, column: 4}
+            loc: {
+              start: {
+                line: 1,
+                column: 3
+              },
+              end: {
+                line: 1,
+                column: 4
+              }
+            }
           }
         ],
-        end: {line: 1, column: 4}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 4
+          }
+        }
       },
-      end: {line: 1, column: 4}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 4
+        }
+      }
     }
   ],
-  end: {line: 1, column: 4}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 4
+    }
+  }
 });
 
 test("\\u0061", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Identifier",
-        start: {line: 1, column: 0},
         name: "a",
-        end: {line: 1, column: 6}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 6
+          }
+        }
       },
-      end: {line: 1, column: 6}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 6
+        }
+      }
     }
   ],
-  end: {line: 1, column: 6}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 6
+    }
+  }
 });
 
 test("a\\u0061", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "Identifier",
-        start: {line: 1, column: 0},
         name: "aa",
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
-      end: {line: 1, column: 7}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 7
+        }
+      }
     }
   ],
-  end: {line: 1, column: 7}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 7
+    }
+  }
 });
 
 test("if (morning) goodMorning()", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "IfStatement",
-      start: {line: 1, column: 0},
       test: {
         type: "Identifier",
-        start: {line: 1, column: 4},
         name: "morning",
-        end: {line: 1, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 4
+          },
+          end: {
+            line: 1,
+            column: 11
+          }
+        }
       },
       consequent: {
         type: "ExpressionStatement",
-        start: {line: 1, column: 13},
         expression: {
           type: "CallExpression",
-          start: {line: 1, column: 13},
           callee: {
             type: "Identifier",
-            start: {line: 1, column: 13},
             name: "goodMorning",
-            end: {line: 1, column: 24}
+            loc: {
+              start: {
+                line: 1,
+                column: 13
+              },
+              end: {
+                line: 1,
+                column: 24
+              }
+            }
           },
           arguments: [],
-          end: {line: 1, column: 26}
+          loc: {
+            start: {
+              line: 1,
+              column: 13
+            },
+            end: {
+              line: 1,
+              column: 26
+            }
+          }
         },
-        end: {line: 1, column: 26}
+        loc: {
+          start: {
+            line: 1,
+            column: 13
+          },
+          end: {
+            line: 1,
+            column: 26
+          }
+        }
       },
       alternate: null,
-      end: {line: 1, column: 26}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 26
+        }
+      }
     }
   ],
-  end: {line: 1, column: 26}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 26
+    }
+  }
 });
 
 test("if (morning) (function(){})", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "IfStatement",
-      start: {line: 1, column: 0},
       test: {
         type: "Identifier",
-        start: {line: 1, column: 4},
         name: "morning",
-        end: {line: 1, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 4
+          },
+          end: {
+            line: 1,
+            column: 11
+          }
+        }
       },
       consequent: {
         type: "ExpressionStatement",
-        start: {line: 1, column: 13},
         expression: {
           type: "FunctionExpression",
-          start: {line: 1, column: 14},
           id: null,
           params: [],
           body: {
             type: "BlockStatement",
-            start: {line: 1, column: 24},
             body: [],
-            end: {line: 1, column: 26}
+            loc: {
+              start: {
+                line: 1,
+                column: 24
+              },
+              end: {
+                line: 1,
+                column: 26
+              }
+            }
           },
-          end: {line: 1, column: 26}
+          loc: {
+            start: {
+              line: 1,
+              column: 14
+            },
+            end: {
+              line: 1,
+              column: 26
+            }
+          }
         },
-        end: {line: 1, column: 27}
+        loc: {
+          start: {
+            line: 1,
+            column: 13
+          },
+          end: {
+            line: 1,
+            column: 27
+          }
+        }
       },
       alternate: null,
-      end: {line: 1, column: 27}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 27
+        }
+      }
     }
   ],
-  end: {line: 1, column: 27}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 27
+    }
+  }
 });
 
 test("if (morning) var x = 0;", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "IfStatement",
-      start: {line: 1, column: 0},
       test: {
         type: "Identifier",
-        start: {line: 1, column: 4},
         name: "morning",
-        end: {line: 1, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 4
+          },
+          end: {
+            line: 1,
+            column: 11
+          }
+        }
       },
       consequent: {
         type: "VariableDeclaration",
-        start: {line: 1, column: 13},
         declarations: [
           {
             type: "VariableDeclarator",
-            start: {line: 1, column: 17},
             id: {
               type: "Identifier",
-              start: {line: 1, column: 17},
               name: "x",
-              end: {line: 1, column: 18}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 17
+                },
+                end: {
+                  line: 1,
+                  column: 18
+                }
+              }
             },
             init: {
               type: "Literal",
-              start: {line: 1, column: 21},
               value: 0,
-              end: {line: 1, column: 22}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 21
+                },
+                end: {
+                  line: 1,
+                  column: 22
+                }
+              }
             },
-            end: {line: 1, column: 22}
+            loc: {
+              start: {
+                line: 1,
+                column: 17
+              },
+              end: {
+                line: 1,
+                column: 22
+              }
+            }
           }
         ],
         kind: "var",
-        end: {line: 1, column: 22}
+        loc: {
+          start: {
+            line: 1,
+            column: 13
+          },
+          end: {
+            line: 1,
+            column: 22
+          }
+        }
       },
       alternate: null,
-      end: {line: 1, column: 23}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 23
+        }
+      }
     }
   ],
-  end: {line: 1, column: 23}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 23
+    }
+  }
 });
 
 test("if (morning) function a(){}", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "IfStatement",
-      start: {line: 1, column: 0},
       test: {
         type: "Identifier",
-        start: {line: 1, column: 4},
         name: "morning",
-        end: {line: 1, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 4
+          },
+          end: {
+            line: 1,
+            column: 11
+          }
+        }
       },
       consequent: {
         type: "FunctionDeclaration",
-        start: {line: 1, column: 13},
         id: {
           type: "Identifier",
-          start: {line: 1, column: 22},
           name: "a",
-          end: {line: 1, column: 23}
+          loc: {
+            start: {
+              line: 1,
+              column: 22
+            },
+            end: {
+              line: 1,
+              column: 23
+            }
+          }
         },
         params: [],
         body: {
           type: "BlockStatement",
-          start: {line: 1, column: 25},
           body: [],
-          end: {line: 1, column: 27}
+          loc: {
+            start: {
+              line: 1,
+              column: 25
+            },
+            end: {
+              line: 1,
+              column: 27
+            }
+          }
         },
-        end: {line: 1, column: 27}
+        loc: {
+          start: {
+            line: 1,
+            column: 13
+          },
+          end: {
+            line: 1,
+            column: 27
+          }
+        }
       },
       alternate: null,
-      end: {line: 1, column: 27}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 27
+        }
+      }
     }
   ],
-  end: {line: 1, column: 27}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 27
+    }
+  }
 });
 
 test("if (morning) goodMorning(); else goodDay()", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "IfStatement",
-      start: {line: 1, column: 0},
       test: {
         type: "Identifier",
-        start: {line: 1, column: 4},
         name: "morning",
-        end: {line: 1, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 4
+          },
+          end: {
+            line: 1,
+            column: 11
+          }
+        }
       },
       consequent: {
         type: "ExpressionStatement",
-        start: {line: 1, column: 13},
         expression: {
           type: "CallExpression",
-          start: {line: 1, column: 13},
           callee: {
             type: "Identifier",
-            start: {line: 1, column: 13},
             name: "goodMorning",
-            end: {line: 1, column: 24}
+            loc: {
+              start: {
+                line: 1,
+                column: 13
+              },
+              end: {
+                line: 1,
+                column: 24
+              }
+            }
           },
           arguments: [],
-          end: {line: 1, column: 26}
+          loc: {
+            start: {
+              line: 1,
+              column: 13
+            },
+            end: {
+              line: 1,
+              column: 26
+            }
+          }
         },
-        end: {line: 1, column: 27}
+        loc: {
+          start: {
+            line: 1,
+            column: 13
+          },
+          end: {
+            line: 1,
+            column: 27
+          }
+        }
       },
       alternate: {
         type: "ExpressionStatement",
-        start: {line: 1, column: 33},
         expression: {
           type: "CallExpression",
-          start: {line: 1, column: 33},
           callee: {
             type: "Identifier",
-            start: {line: 1, column: 33},
             name: "goodDay",
-            end: {line: 1, column: 40}
+            loc: {
+              start: {
+                line: 1,
+                column: 33
+              },
+              end: {
+                line: 1,
+                column: 40
+              }
+            }
           },
           arguments: [],
-          end: {line: 1, column: 42}
+          loc: {
+            start: {
+              line: 1,
+              column: 33
+            },
+            end: {
+              line: 1,
+              column: 42
+            }
+          }
         },
-        end: {line: 1, column: 42}
+        loc: {
+          start: {
+            line: 1,
+            column: 33
+          },
+          end: {
+            line: 1,
+            column: 42
+          }
+        }
       },
-      end: {line: 1, column: 42}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 42
+        }
+      }
     }
   ],
-  end: {line: 1, column: 42}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 42
+    }
+  }
 });
 
 test("do keep(); while (true)", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "DoWhileStatement",
-      start: {line: 1, column: 0},
       body: {
         type: "ExpressionStatement",
-        start: {line: 1, column: 3},
         expression: {
           type: "CallExpression",
-          start: {line: 1, column: 3},
           callee: {
             type: "Identifier",
-            start: {line: 1, column: 3},
             name: "keep",
-            end: {line: 1, column: 7}
+            loc: {
+              start: {
+                line: 1,
+                column: 3
+              },
+              end: {
+                line: 1,
+                column: 7
+              }
+            }
           },
           arguments: [],
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 3
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 10}
+        loc: {
+          start: {
+            line: 1,
+            column: 3
+          },
+          end: {
+            line: 1,
+            column: 10
+          }
+        }
       },
       test: {
         type: "Literal",
-        start: {line: 1, column: 18},
         value: true,
-        end: {line: 1, column: 22}
+        loc: {
+          start: {
+            line: 1,
+            column: 18
+          },
+          end: {
+            line: 1,
+            column: 22
+          }
+        }
       },
-      end: {line: 1, column: 23}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 23
+        }
+      }
     }
   ],
-  end: {line: 1, column: 23}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 23
+    }
+  }
 });
 
 test("do keep(); while (true);", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "DoWhileStatement",
-      start: {line: 1, column: 0},
       body: {
         type: "ExpressionStatement",
-        start: {line: 1, column: 3},
         expression: {
           type: "CallExpression",
-          start: {line: 1, column: 3},
           callee: {
             type: "Identifier",
-            start: {line: 1, column: 3},
             name: "keep",
-            end: {line: 1, column: 7}
+            loc: {
+              start: {
+                line: 1,
+                column: 3
+              },
+              end: {
+                line: 1,
+                column: 7
+              }
+            }
           },
           arguments: [],
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 3
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 10}
+        loc: {
+          start: {
+            line: 1,
+            column: 3
+          },
+          end: {
+            line: 1,
+            column: 10
+          }
+        }
       },
       test: {
         type: "Literal",
-        start: {line: 1, column: 18},
         value: true,
-        end: {line: 1, column: 22}
+        loc: {
+          start: {
+            line: 1,
+            column: 18
+          },
+          end: {
+            line: 1,
+            column: 22
+          }
+        }
       },
-      end: {line: 1, column: 23}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 23
+        }
+      }
     },
     {
       type: "EmptyStatement",
-      start: {line: 1, column: 23},
-      end: {line: 1, column: 24}
+      loc: {
+        start: {
+          line: 1,
+          column: 23
+        },
+        end: {
+          line: 1,
+          column: 24
+        }
+      }
     }
   ],
-  end: {line: 1, column: 24}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 24
+    }
+  }
 });
 
 test("do { x++; y--; } while (x < 10)", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "DoWhileStatement",
-      start: {line: 1, column: 0},
       body: {
         type: "BlockStatement",
-        start: {line: 1, column: 3},
         body: [
           {
             type: "ExpressionStatement",
-            start: {line: 1, column: 5},
             expression: {
               type: "UpdateExpression",
-              start: {line: 1, column: 5},
               operator: "++",
               prefix: false,
               argument: {
                 type: "Identifier",
-                start: {line: 1, column: 5},
                 name: "x",
-                end: {line: 1, column: 6}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 5
+                  },
+                  end: {
+                    line: 1,
+                    column: 6
+                  }
+                }
               },
-              end: {line: 1, column: 8}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 5
+                },
+                end: {
+                  line: 1,
+                  column: 8
+                }
+              }
             },
-            end: {line: 1, column: 9}
+            loc: {
+              start: {
+                line: 1,
+                column: 5
+              },
+              end: {
+                line: 1,
+                column: 9
+              }
+            }
           },
           {
             type: "ExpressionStatement",
-            start: {line: 1, column: 10},
             expression: {
               type: "UpdateExpression",
-              start: {line: 1, column: 10},
               operator: "--",
               prefix: false,
               argument: {
                 type: "Identifier",
-                start: {line: 1, column: 10},
                 name: "y",
-                end: {line: 1, column: 11}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 10
+                  },
+                  end: {
+                    line: 1,
+                    column: 11
+                  }
+                }
               },
-              end: {line: 1, column: 13}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 10
+                },
+                end: {
+                  line: 1,
+                  column: 13
+                }
+              }
             },
-            end: {line: 1, column: 14}
+            loc: {
+              start: {
+                line: 1,
+                column: 10
+              },
+              end: {
+                line: 1,
+                column: 14
+              }
+            }
           }
         ],
-        end: {line: 1, column: 16}
+        loc: {
+          start: {
+            line: 1,
+            column: 3
+          },
+          end: {
+            line: 1,
+            column: 16
+          }
+        }
       },
       test: {
         type: "BinaryExpression",
-        start: {line: 1, column: 24},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 24},
           name: "x",
-          end: {line: 1, column: 25}
+          loc: {
+            start: {
+              line: 1,
+              column: 24
+            },
+            end: {
+              line: 1,
+              column: 25
+            }
+          }
         },
         operator: "<",
         right: {
           type: "Literal",
-          start: {line: 1, column: 28},
           value: 10,
-          end: {line: 1, column: 30}
+          loc: {
+            start: {
+              line: 1,
+              column: 28
+            },
+            end: {
+              line: 1,
+              column: 30
+            }
+          }
         },
-        end: {line: 1, column: 30}
+        loc: {
+          start: {
+            line: 1,
+            column: 24
+          },
+          end: {
+            line: 1,
+            column: 30
+          }
+        }
       },
-      end: {line: 1, column: 31}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 31
+        }
+      }
     }
   ],
-  end: {line: 1, column: 31}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 31
+    }
+  }
 });
 
 test("{ do { } while (false) false }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "BlockStatement",
-      start: {line: 1, column: 0},
       body: [
         {
           type: "DoWhileStatement",
-          start: {line: 1, column: 2},
           body: {
             type: "BlockStatement",
-            start: {line: 1, column: 5},
             body: [],
-            end: {line: 1, column: 8}
+            loc: {
+              start: {
+                line: 1,
+                column: 5
+              },
+              end: {
+                line: 1,
+                column: 8
+              }
+            }
           },
           test: {
             type: "Literal",
-            start: {line: 1, column: 16},
             value: false,
-            end: {line: 1, column: 21}
+            loc: {
+              start: {
+                line: 1,
+                column: 16
+              },
+              end: {
+                line: 1,
+                column: 21
+              }
+            }
           },
-          end: {line: 1, column: 22}
+          loc: {
+            start: {
+              line: 1,
+              column: 2
+            },
+            end: {
+              line: 1,
+              column: 22
+            }
+          }
         },
         {
           type: "ExpressionStatement",
-          start: {line: 1, column: 23},
           expression: {
             type: "Literal",
-            start: {line: 1, column: 23},
             value: false,
-            end: {line: 1, column: 28}
+            loc: {
+              start: {
+                line: 1,
+                column: 23
+              },
+              end: {
+                line: 1,
+                column: 28
+              }
+            }
           },
-          end: {line: 1, column: 28}
+          loc: {
+            start: {
+              line: 1,
+              column: 23
+            },
+            end: {
+              line: 1,
+              column: 28
+            }
+          }
         }
       ],
-      end: {line: 1, column: 30}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 30
+        }
+      }
     }
   ],
-  end: {line: 1, column: 30}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 30
+    }
+  }
 });
 
 test("while (true) doSomething()", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "WhileStatement",
-      start: {line: 1, column: 0},
       test: {
         type: "Literal",
-        start: {line: 1, column: 7},
         value: true,
-        end: {line: 1, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 7
+          },
+          end: {
+            line: 1,
+            column: 11
+          }
+        }
       },
       body: {
         type: "ExpressionStatement",
-        start: {line: 1, column: 13},
         expression: {
           type: "CallExpression",
-          start: {line: 1, column: 13},
           callee: {
             type: "Identifier",
-            start: {line: 1, column: 13},
             name: "doSomething",
-            end: {line: 1, column: 24}
+            loc: {
+              start: {
+                line: 1,
+                column: 13
+              },
+              end: {
+                line: 1,
+                column: 24
+              }
+            }
           },
           arguments: [],
-          end: {line: 1, column: 26}
+          loc: {
+            start: {
+              line: 1,
+              column: 13
+            },
+            end: {
+              line: 1,
+              column: 26
+            }
+          }
         },
-        end: {line: 1, column: 26}
+        loc: {
+          start: {
+            line: 1,
+            column: 13
+          },
+          end: {
+            line: 1,
+            column: 26
+          }
+        }
       },
-      end: {line: 1, column: 26}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 26
+        }
+      }
     }
   ],
-  end: {line: 1, column: 26}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 26
+    }
+  }
 });
 
 test("while (x < 10) { x++; y--; }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "WhileStatement",
-      start: {line: 1, column: 0},
       test: {
         type: "BinaryExpression",
-        start: {line: 1, column: 7},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 7},
           name: "x",
-          end: {line: 1, column: 8}
+          loc: {
+            start: {
+              line: 1,
+              column: 7
+            },
+            end: {
+              line: 1,
+              column: 8
+            }
+          }
         },
         operator: "<",
         right: {
           type: "Literal",
-          start: {line: 1, column: 11},
           value: 10,
-          end: {line: 1, column: 13}
+          loc: {
+            start: {
+              line: 1,
+              column: 11
+            },
+            end: {
+              line: 1,
+              column: 13
+            }
+          }
         },
-        end: {line: 1, column: 13}
+        loc: {
+          start: {
+            line: 1,
+            column: 7
+          },
+          end: {
+            line: 1,
+            column: 13
+          }
+        }
       },
       body: {
         type: "BlockStatement",
-        start: {line: 1, column: 15},
         body: [
           {
             type: "ExpressionStatement",
-            start: {line: 1, column: 17},
             expression: {
               type: "UpdateExpression",
-              start: {line: 1, column: 17},
               operator: "++",
               prefix: false,
               argument: {
                 type: "Identifier",
-                start: {line: 1, column: 17},
                 name: "x",
-                end: {line: 1, column: 18}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 17
+                  },
+                  end: {
+                    line: 1,
+                    column: 18
+                  }
+                }
               },
-              end: {line: 1, column: 20}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 17
+                },
+                end: {
+                  line: 1,
+                  column: 20
+                }
+              }
             },
-            end: {line: 1, column: 21}
+            loc: {
+              start: {
+                line: 1,
+                column: 17
+              },
+              end: {
+                line: 1,
+                column: 21
+              }
+            }
           },
           {
             type: "ExpressionStatement",
-            start: {line: 1, column: 22},
             expression: {
               type: "UpdateExpression",
-              start: {line: 1, column: 22},
               operator: "--",
               prefix: false,
               argument: {
                 type: "Identifier",
-                start: {line: 1, column: 22},
                 name: "y",
-                end: {line: 1, column: 23}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 22
+                  },
+                  end: {
+                    line: 1,
+                    column: 23
+                  }
+                }
               },
-              end: {line: 1, column: 25}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 22
+                },
+                end: {
+                  line: 1,
+                  column: 25
+                }
+              }
             },
-            end: {line: 1, column: 26}
+            loc: {
+              start: {
+                line: 1,
+                column: 22
+              },
+              end: {
+                line: 1,
+                column: 26
+              }
+            }
           }
         ],
-        end: {line: 1, column: 28}
+        loc: {
+          start: {
+            line: 1,
+            column: 15
+          },
+          end: {
+            line: 1,
+            column: 28
+          }
+        }
       },
-      end: {line: 1, column: 28}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 28
+        }
+      }
     }
   ],
-  end: {line: 1, column: 28}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 28
+    }
+  }
 });
 
 test("for(;;);", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ForStatement",
-      start: {line: 1, column: 0},
       init: null,
       test: null,
       update: null,
       body: {
         type: "EmptyStatement",
-        start: {line: 1, column: 7},
-        end: {line: 1, column: 8}
+        loc: {
+          start: {
+            line: 1,
+            column: 7
+          },
+          end: {
+            line: 1,
+            column: 8
+          }
+        }
       },
-      end: {line: 1, column: 8}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 8
+        }
+      }
     }
   ],
-  end: {line: 1, column: 8}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 8
+    }
+  }
 });
 
 test("for(;;){}", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ForStatement",
-      start: {line: 1, column: 0},
       init: null,
       test: null,
       update: null,
       body: {
         type: "BlockStatement",
-        start: {line: 1, column: 7},
         body: [],
-        end: {line: 1, column: 9}
+        loc: {
+          start: {
+            line: 1,
+            column: 7
+          },
+          end: {
+            line: 1,
+            column: 9
+          }
+        }
       },
-      end: {line: 1, column: 9}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 9
+        }
+      }
     }
   ],
-  end: {line: 1, column: 9}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 9
+    }
+  }
 });
 
 test("for(x = 0;;);", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ForStatement",
-      start: {line: 1, column: 0},
       init: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 4},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 4},
           name: "x",
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
         right: {
           type: "Literal",
-          start: {line: 1, column: 8},
           value: 0,
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 8
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 9}
+        loc: {
+          start: {
+            line: 1,
+            column: 4
+          },
+          end: {
+            line: 1,
+            column: 9
+          }
+        }
       },
       test: null,
       update: null,
       body: {
         type: "EmptyStatement",
-        start: {line: 1, column: 12},
-        end: {line: 1, column: 13}
+        loc: {
+          start: {
+            line: 1,
+            column: 12
+          },
+          end: {
+            line: 1,
+            column: 13
+          }
+        }
       },
-      end: {line: 1, column: 13}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 13
+        }
+      }
     }
   ],
-  end: {line: 1, column: 13}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 13
+    }
+  }
 });
 
 test("for(var x = 0;;);", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ForStatement",
-      start: {line: 1, column: 0},
       init: {
         type: "VariableDeclaration",
-        start: {line: 1, column: 4},
         declarations: [
           {
             type: "VariableDeclarator",
-            start: {line: 1, column: 8},
             id: {
               type: "Identifier",
-              start: {line: 1, column: 8},
               name: "x",
-              end: {line: 1, column: 9}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 8
+                },
+                end: {
+                  line: 1,
+                  column: 9
+                }
+              }
             },
             init: {
               type: "Literal",
-              start: {line: 1, column: 12},
               value: 0,
-              end: {line: 1, column: 13}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 12
+                },
+                end: {
+                  line: 1,
+                  column: 13
+                }
+              }
             },
-            end: {line: 1, column: 13}
+            loc: {
+              start: {
+                line: 1,
+                column: 8
+              },
+              end: {
+                line: 1,
+                column: 13
+              }
+            }
           }
         ],
         kind: "var",
-        end: {line: 1, column: 13}
+        loc: {
+          start: {
+            line: 1,
+            column: 4
+          },
+          end: {
+            line: 1,
+            column: 13
+          }
+        }
       },
       test: null,
       update: null,
       body: {
         type: "EmptyStatement",
-        start: {line: 1, column: 16},
-        end: {line: 1, column: 17}
+        loc: {
+          start: {
+            line: 1,
+            column: 16
+          },
+          end: {
+            line: 1,
+            column: 17
+          }
+        }
       },
-      end: {line: 1, column: 17}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 17
+        }
+      }
     }
   ],
-  end: {line: 1, column: 17}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 17
+    }
+  }
 });
 
 test("for(var x = 0, y = 1;;);", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ForStatement",
-      start: {line: 1, column: 0},
       init: {
         type: "VariableDeclaration",
-        start: {line: 1, column: 4},
         declarations: [
           {
             type: "VariableDeclarator",
-            start: {line: 1, column: 8},
             id: {
               type: "Identifier",
-              start: {line: 1, column: 8},
               name: "x",
-              end: {line: 1, column: 9}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 8
+                },
+                end: {
+                  line: 1,
+                  column: 9
+                }
+              }
             },
             init: {
               type: "Literal",
-              start: {line: 1, column: 12},
               value: 0,
-              end: {line: 1, column: 13}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 12
+                },
+                end: {
+                  line: 1,
+                  column: 13
+                }
+              }
             },
-            end: {line: 1, column: 13}
+            loc: {
+              start: {
+                line: 1,
+                column: 8
+              },
+              end: {
+                line: 1,
+                column: 13
+              }
+            }
           },
           {
             type: "VariableDeclarator",
-            start: {line: 1, column: 15},
             id: {
               type: "Identifier",
-              start: {line: 1, column: 15},
               name: "y",
-              end: {line: 1, column: 16}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 15
+                },
+                end: {
+                  line: 1,
+                  column: 16
+                }
+              }
             },
             init: {
               type: "Literal",
-              start: {line: 1, column: 19},
               value: 1,
-              end: {line: 1, column: 20}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 19
+                },
+                end: {
+                  line: 1,
+                  column: 20
+                }
+              }
             },
-            end: {line: 1, column: 20}
+            loc: {
+              start: {
+                line: 1,
+                column: 15
+              },
+              end: {
+                line: 1,
+                column: 20
+              }
+            }
           }
         ],
         kind: "var",
-        end: {line: 1, column: 20}
+        loc: {
+          start: {
+            line: 1,
+            column: 4
+          },
+          end: {
+            line: 1,
+            column: 20
+          }
+        }
       },
       test: null,
       update: null,
       body: {
         type: "EmptyStatement",
-        start: {line: 1, column: 23},
-        end: {line: 1, column: 24}
+        loc: {
+          start: {
+            line: 1,
+            column: 23
+          },
+          end: {
+            line: 1,
+            column: 24
+          }
+        }
       },
-      end: {line: 1, column: 24}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 24
+        }
+      }
     }
   ],
-  end: {line: 1, column: 24}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 24
+    }
+  }
 });
 
 test("for(x = 0; x < 42;);", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ForStatement",
-      start: {line: 1, column: 0},
       init: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 4},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 4},
           name: "x",
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
         right: {
           type: "Literal",
-          start: {line: 1, column: 8},
           value: 0,
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 8
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 9}
+        loc: {
+          start: {
+            line: 1,
+            column: 4
+          },
+          end: {
+            line: 1,
+            column: 9
+          }
+        }
       },
       test: {
         type: "BinaryExpression",
-        start: {line: 1, column: 11},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 11},
           name: "x",
-          end: {line: 1, column: 12}
+          loc: {
+            start: {
+              line: 1,
+              column: 11
+            },
+            end: {
+              line: 1,
+              column: 12
+            }
+          }
         },
         operator: "<",
         right: {
           type: "Literal",
-          start: {line: 1, column: 15},
           value: 42,
-          end: {line: 1, column: 17}
+          loc: {
+            start: {
+              line: 1,
+              column: 15
+            },
+            end: {
+              line: 1,
+              column: 17
+            }
+          }
         },
-        end: {line: 1, column: 17}
+        loc: {
+          start: {
+            line: 1,
+            column: 11
+          },
+          end: {
+            line: 1,
+            column: 17
+          }
+        }
       },
       update: null,
       body: {
         type: "EmptyStatement",
-        start: {line: 1, column: 19},
-        end: {line: 1, column: 20}
+        loc: {
+          start: {
+            line: 1,
+            column: 19
+          },
+          end: {
+            line: 1,
+            column: 20
+          }
+        }
       },
-      end: {line: 1, column: 20}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 20
+        }
+      }
     }
   ],
-  end: {line: 1, column: 20}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 20
+    }
+  }
 });
 
 test("for(x = 0; x < 42; x++);", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ForStatement",
-      start: {line: 1, column: 0},
       init: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 4},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 4},
           name: "x",
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
         right: {
           type: "Literal",
-          start: {line: 1, column: 8},
           value: 0,
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 8
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 9}
+        loc: {
+          start: {
+            line: 1,
+            column: 4
+          },
+          end: {
+            line: 1,
+            column: 9
+          }
+        }
       },
       test: {
         type: "BinaryExpression",
-        start: {line: 1, column: 11},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 11},
           name: "x",
-          end: {line: 1, column: 12}
+          loc: {
+            start: {
+              line: 1,
+              column: 11
+            },
+            end: {
+              line: 1,
+              column: 12
+            }
+          }
         },
         operator: "<",
         right: {
           type: "Literal",
-          start: {line: 1, column: 15},
           value: 42,
-          end: {line: 1, column: 17}
+          loc: {
+            start: {
+              line: 1,
+              column: 15
+            },
+            end: {
+              line: 1,
+              column: 17
+            }
+          }
         },
-        end: {line: 1, column: 17}
+        loc: {
+          start: {
+            line: 1,
+            column: 11
+          },
+          end: {
+            line: 1,
+            column: 17
+          }
+        }
       },
       update: {
         type: "UpdateExpression",
-        start: {line: 1, column: 19},
         operator: "++",
         prefix: false,
         argument: {
           type: "Identifier",
-          start: {line: 1, column: 19},
           name: "x",
-          end: {line: 1, column: 20}
+          loc: {
+            start: {
+              line: 1,
+              column: 19
+            },
+            end: {
+              line: 1,
+              column: 20
+            }
+          }
         },
-        end: {line: 1, column: 22}
+        loc: {
+          start: {
+            line: 1,
+            column: 19
+          },
+          end: {
+            line: 1,
+            column: 22
+          }
+        }
       },
       body: {
         type: "EmptyStatement",
-        start: {line: 1, column: 23},
-        end: {line: 1, column: 24}
+        loc: {
+          start: {
+            line: 1,
+            column: 23
+          },
+          end: {
+            line: 1,
+            column: 24
+          }
+        }
       },
-      end: {line: 1, column: 24}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 24
+        }
+      }
     }
   ],
-  end: {line: 1, column: 24}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 24
+    }
+  }
 });
 
 test("for(x = 0; x < 42; x++) process(x);", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ForStatement",
-      start: {line: 1, column: 0},
       init: {
         type: "AssignmentExpression",
-        start: {line: 1, column: 4},
         operator: "=",
         left: {
           type: "Identifier",
-          start: {line: 1, column: 4},
           name: "x",
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         },
         right: {
           type: "Literal",
-          start: {line: 1, column: 8},
           value: 0,
-          end: {line: 1, column: 9}
+          loc: {
+            start: {
+              line: 1,
+              column: 8
+            },
+            end: {
+              line: 1,
+              column: 9
+            }
+          }
         },
-        end: {line: 1, column: 9}
+        loc: {
+          start: {
+            line: 1,
+            column: 4
+          },
+          end: {
+            line: 1,
+            column: 9
+          }
+        }
       },
       test: {
         type: "BinaryExpression",
-        start: {line: 1, column: 11},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 11},
           name: "x",
-          end: {line: 1, column: 12}
+          loc: {
+            start: {
+              line: 1,
+              column: 11
+            },
+            end: {
+              line: 1,
+              column: 12
+            }
+          }
         },
         operator: "<",
         right: {
           type: "Literal",
-          start: {line: 1, column: 15},
           value: 42,
-          end: {line: 1, column: 17}
+          loc: {
+            start: {
+              line: 1,
+              column: 15
+            },
+            end: {
+              line: 1,
+              column: 17
+            }
+          }
         },
-        end: {line: 1, column: 17}
+        loc: {
+          start: {
+            line: 1,
+            column: 11
+          },
+          end: {
+            line: 1,
+            column: 17
+          }
+        }
       },
       update: {
         type: "UpdateExpression",
-        start: {line: 1, column: 19},
         operator: "++",
         prefix: false,
         argument: {
           type: "Identifier",
-          start: {line: 1, column: 19},
           name: "x",
-          end: {line: 1, column: 20}
+          loc: {
+            start: {
+              line: 1,
+              column: 19
+            },
+            end: {
+              line: 1,
+              column: 20
+            }
+          }
         },
-        end: {line: 1, column: 22}
+        loc: {
+          start: {
+            line: 1,
+            column: 19
+          },
+          end: {
+            line: 1,
+            column: 22
+          }
+        }
       },
       body: {
         type: "ExpressionStatement",
-        start: {line: 1, column: 24},
         expression: {
           type: "CallExpression",
-          start: {line: 1, column: 24},
           callee: {
             type: "Identifier",
-            start: {line: 1, column: 24},
             name: "process",
-            end: {line: 1, column: 31}
+            loc: {
+              start: {
+                line: 1,
+                column: 24
+              },
+              end: {
+                line: 1,
+                column: 31
+              }
+            }
           },
           arguments: [
             {
               type: "Identifier",
-              start: {line: 1, column: 32},
               name: "x",
-              end: {line: 1, column: 33}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 32
+                },
+                end: {
+                  line: 1,
+                  column: 33
+                }
+              }
             }
           ],
-          end: {line: 1, column: 34}
+          loc: {
+            start: {
+              line: 1,
+              column: 24
+            },
+            end: {
+              line: 1,
+              column: 34
+            }
+          }
         },
-        end: {line: 1, column: 35}
+        loc: {
+          start: {
+            line: 1,
+            column: 24
+          },
+          end: {
+            line: 1,
+            column: 35
+          }
+        }
       },
-      end: {line: 1, column: 35}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 35
+        }
+      }
     }
   ],
-  end: {line: 1, column: 35}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 35
+    }
+  }
 });
 
 test("for(x in list) process(x);", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ForInStatement",
-      start: {line: 1, column: 0},
       left: {
         type: "Identifier",
-        start: {line: 1, column: 4},
         name: "x",
-        end: {line: 1, column: 5}
+        loc: {
+          start: {
+            line: 1,
+            column: 4
+          },
+          end: {
+            line: 1,
+            column: 5
+          }
+        }
       },
       right: {
         type: "Identifier",
-        start: {line: 1, column: 9},
         name: "list",
-        end: {line: 1, column: 13}
+        loc: {
+          start: {
+            line: 1,
+            column: 9
+          },
+          end: {
+            line: 1,
+            column: 13
+          }
+        }
       },
       body: {
         type: "ExpressionStatement",
-        start: {line: 1, column: 15},
         expression: {
           type: "CallExpression",
-          start: {line: 1, column: 15},
           callee: {
             type: "Identifier",
-            start: {line: 1, column: 15},
             name: "process",
-            end: {line: 1, column: 22}
+            loc: {
+              start: {
+                line: 1,
+                column: 15
+              },
+              end: {
+                line: 1,
+                column: 22
+              }
+            }
           },
           arguments: [
             {
               type: "Identifier",
-              start: {line: 1, column: 23},
               name: "x",
-              end: {line: 1, column: 24}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 23
+                },
+                end: {
+                  line: 1,
+                  column: 24
+                }
+              }
             }
           ],
-          end: {line: 1, column: 25}
+          loc: {
+            start: {
+              line: 1,
+              column: 15
+            },
+            end: {
+              line: 1,
+              column: 25
+            }
+          }
         },
-        end: {line: 1, column: 26}
+        loc: {
+          start: {
+            line: 1,
+            column: 15
+          },
+          end: {
+            line: 1,
+            column: 26
+          }
+        }
       },
-      end: {line: 1, column: 26}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 26
+        }
+      }
     }
   ],
-  end: {line: 1, column: 26}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 26
+    }
+  }
 });
 
 test("for (var x in list) process(x);", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ForInStatement",
-      start: {line: 1, column: 0},
       left: {
         type: "VariableDeclaration",
-        start: {line: 1, column: 5},
         declarations: [
           {
             type: "VariableDeclarator",
-            start: {line: 1, column: 9},
             id: {
               type: "Identifier",
-              start: {line: 1, column: 9},
               name: "x",
-              end: {line: 1, column: 10}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 9
+                },
+                end: {
+                  line: 1,
+                  column: 10
+                }
+              }
             },
             init: null,
-            end: {line: 1, column: 10}
+            loc: {
+              start: {
+                line: 1,
+                column: 9
+              },
+              end: {
+                line: 1,
+                column: 10
+              }
+            }
           }
         ],
         kind: "var",
-        end: {line: 1, column: 10}
+        loc: {
+          start: {
+            line: 1,
+            column: 5
+          },
+          end: {
+            line: 1,
+            column: 10
+          }
+        }
       },
       right: {
         type: "Identifier",
-        start: {line: 1, column: 14},
         name: "list",
-        end: {line: 1, column: 18}
+        loc: {
+          start: {
+            line: 1,
+            column: 14
+          },
+          end: {
+            line: 1,
+            column: 18
+          }
+        }
       },
       body: {
         type: "ExpressionStatement",
-        start: {line: 1, column: 20},
         expression: {
           type: "CallExpression",
-          start: {line: 1, column: 20},
           callee: {
             type: "Identifier",
-            start: {line: 1, column: 20},
             name: "process",
-            end: {line: 1, column: 27}
+            loc: {
+              start: {
+                line: 1,
+                column: 20
+              },
+              end: {
+                line: 1,
+                column: 27
+              }
+            }
           },
           arguments: [
             {
               type: "Identifier",
-              start: {line: 1, column: 28},
               name: "x",
-              end: {line: 1, column: 29}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 28
+                },
+                end: {
+                  line: 1,
+                  column: 29
+                }
+              }
             }
           ],
-          end: {line: 1, column: 30}
+          loc: {
+            start: {
+              line: 1,
+              column: 20
+            },
+            end: {
+              line: 1,
+              column: 30
+            }
+          }
         },
-        end: {line: 1, column: 31}
+        loc: {
+          start: {
+            line: 1,
+            column: 20
+          },
+          end: {
+            line: 1,
+            column: 31
+          }
+        }
       },
-      end: {line: 1, column: 31}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 31
+        }
+      }
     }
   ],
-  end: {line: 1, column: 31}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 31
+    }
+  }
 });
 
 test("for (var x = 42 in list) process(x);", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ForInStatement",
-      start: {line: 1, column: 0},
       left: {
         type: "VariableDeclaration",
-        start: {line: 1, column: 5},
         declarations: [
           {
             type: "VariableDeclarator",
-            start: {line: 1, column: 9},
             id: {
               type: "Identifier",
-              start: {line: 1, column: 9},
               name: "x",
-              end: {line: 1, column: 10}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 9
+                },
+                end: {
+                  line: 1,
+                  column: 10
+                }
+              }
             },
             init: {
               type: "Literal",
-              start: {line: 1, column: 13},
               value: 42,
-              end: {line: 1, column: 15}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 13
+                },
+                end: {
+                  line: 1,
+                  column: 15
+                }
+              }
             },
-            end: {line: 1, column: 15}
+            loc: {
+              start: {
+                line: 1,
+                column: 9
+              },
+              end: {
+                line: 1,
+                column: 15
+              }
+            }
           }
         ],
         kind: "var",
-        end: {line: 1, column: 15}
+        loc: {
+          start: {
+            line: 1,
+            column: 5
+          },
+          end: {
+            line: 1,
+            column: 15
+          }
+        }
       },
       right: {
         type: "Identifier",
-        start: {line: 1, column: 19},
         name: "list",
-        end: {line: 1, column: 23}
+        loc: {
+          start: {
+            line: 1,
+            column: 19
+          },
+          end: {
+            line: 1,
+            column: 23
+          }
+        }
       },
       body: {
         type: "ExpressionStatement",
-        start: {line: 1, column: 25},
         expression: {
           type: "CallExpression",
-          start: {line: 1, column: 25},
           callee: {
             type: "Identifier",
-            start: {line: 1, column: 25},
             name: "process",
-            end: {line: 1, column: 32}
+            loc: {
+              start: {
+                line: 1,
+                column: 25
+              },
+              end: {
+                line: 1,
+                column: 32
+              }
+            }
           },
           arguments: [
             {
               type: "Identifier",
-              start: {line: 1, column: 33},
               name: "x",
-              end: {line: 1, column: 34}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 33
+                },
+                end: {
+                  line: 1,
+                  column: 34
+                }
+              }
             }
           ],
-          end: {line: 1, column: 35}
+          loc: {
+            start: {
+              line: 1,
+              column: 25
+            },
+            end: {
+              line: 1,
+              column: 35
+            }
+          }
         },
-        end: {line: 1, column: 36}
+        loc: {
+          start: {
+            line: 1,
+            column: 25
+          },
+          end: {
+            line: 1,
+            column: 36
+          }
+        }
       },
-      end: {line: 1, column: 36}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 36
+        }
+      }
     }
   ],
-  end: {line: 1, column: 36}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 36
+    }
+  }
 });
 
 test("for (var i = function() { return 10 in [] } in list) process(x);", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ForInStatement",
-      start: {line: 1, column: 0},
       left: {
         type: "VariableDeclaration",
-        start: {line: 1, column: 5},
         declarations: [
           {
             type: "VariableDeclarator",
-            start: {line: 1, column: 9},
             id: {
               type: "Identifier",
-              start: {line: 1, column: 9},
               name: "i",
-              end: {line: 1, column: 10}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 9
+                },
+                end: {
+                  line: 1,
+                  column: 10
+                }
+              }
             },
             init: {
               type: "FunctionExpression",
-              start: {line: 1, column: 13},
               id: null,
               params: [],
               body: {
                 type: "BlockStatement",
-                start: {line: 1, column: 24},
                 body: [
                   {
                     type: "ReturnStatement",
-                    start: {line: 1, column: 26},
                     argument: {
                       type: "BinaryExpression",
-                      start: {line: 1, column: 33},
                       left: {
                         type: "Literal",
-                        start: {line: 1, column: 33},
                         value: 10,
-                        end: {line: 1, column: 35}
+                        loc: {
+                          start: {
+                            line: 1,
+                            column: 33
+                          },
+                          end: {
+                            line: 1,
+                            column: 35
+                          }
+                        }
                       },
                       operator: "in",
                       right: {
                         type: "ArrayExpression",
-                        start: {line: 1, column: 39},
                         elements: [],
-                        end: {line: 1, column: 41}
+                        loc: {
+                          start: {
+                            line: 1,
+                            column: 39
+                          },
+                          end: {
+                            line: 1,
+                            column: 41
+                          }
+                        }
                       },
-                      end: {line: 1, column: 41}
+                      loc: {
+                        start: {
+                          line: 1,
+                          column: 33
+                        },
+                        end: {
+                          line: 1,
+                          column: 41
+                        }
+                      }
                     },
-                    end: {line: 1, column: 41}
+                    loc: {
+                      start: {
+                        line: 1,
+                        column: 26
+                      },
+                      end: {
+                        line: 1,
+                        column: 41
+                      }
+                    }
                   }
                 ],
-                end: {line: 1, column: 43}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 24
+                  },
+                  end: {
+                    line: 1,
+                    column: 43
+                  }
+                }
               },
-              end: {line: 1, column: 43}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 13
+                },
+                end: {
+                  line: 1,
+                  column: 43
+                }
+              }
             },
-            end: {line: 1, column: 43}
+            loc: {
+              start: {
+                line: 1,
+                column: 9
+              },
+              end: {
+                line: 1,
+                column: 43
+              }
+            }
           }
         ],
         kind: "var",
-        end: {line: 1, column: 43}
+        loc: {
+          start: {
+            line: 1,
+            column: 5
+          },
+          end: {
+            line: 1,
+            column: 43
+          }
+        }
       },
       right: {
         type: "Identifier",
-        start: {line: 1, column: 47},
         name: "list",
-        end: {line: 1, column: 51}
+        loc: {
+          start: {
+            line: 1,
+            column: 47
+          },
+          end: {
+            line: 1,
+            column: 51
+          }
+        }
       },
       body: {
         type: "ExpressionStatement",
-        start: {line: 1, column: 53},
         expression: {
           type: "CallExpression",
-          start: {line: 1, column: 53},
           callee: {
             type: "Identifier",
-            start: {line: 1, column: 53},
             name: "process",
-            end: {line: 1, column: 60}
+            loc: {
+              start: {
+                line: 1,
+                column: 53
+              },
+              end: {
+                line: 1,
+                column: 60
+              }
+            }
           },
           arguments: [
             {
               type: "Identifier",
-              start: {line: 1, column: 61},
               name: "x",
-              end: {line: 1, column: 62}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 61
+                },
+                end: {
+                  line: 1,
+                  column: 62
+                }
+              }
             }
           ],
-          end: {line: 1, column: 63}
+          loc: {
+            start: {
+              line: 1,
+              column: 53
+            },
+            end: {
+              line: 1,
+              column: 63
+            }
+          }
         },
-        end: {line: 1, column: 64}
+        loc: {
+          start: {
+            line: 1,
+            column: 53
+          },
+          end: {
+            line: 1,
+            column: 64
+          }
+        }
       },
-      end: {line: 1, column: 64}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 64
+        }
+      }
     }
   ],
-  end: {line: 1, column: 64}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 64
+    }
+  }
 });
 
 test("while (true) { continue; }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "WhileStatement",
-      start: {line: 1, column: 0},
       test: {
         type: "Literal",
-        start: {line: 1, column: 7},
         value: true,
-        end: {line: 1, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 7
+          },
+          end: {
+            line: 1,
+            column: 11
+          }
+        }
       },
       body: {
         type: "BlockStatement",
-        start: {line: 1, column: 13},
         body: [
           {
             type: "ContinueStatement",
-            start: {line: 1, column: 15},
             label: null,
-            end: {line: 1, column: 24}
+            loc: {
+              start: {
+                line: 1,
+                column: 15
+              },
+              end: {
+                line: 1,
+                column: 24
+              }
+            }
           }
         ],
-        end: {line: 1, column: 26}
+        loc: {
+          start: {
+            line: 1,
+            column: 13
+          },
+          end: {
+            line: 1,
+            column: 26
+          }
+        }
       },
-      end: {line: 1, column: 26}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 26
+        }
+      }
     }
   ],
-  end: {line: 1, column: 26}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 26
+    }
+  }
 });
 
 test("while (true) { continue }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "WhileStatement",
-      start: {line: 1, column: 0},
       test: {
         type: "Literal",
-        start: {line: 1, column: 7},
         value: true,
-        end: {line: 1, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 7
+          },
+          end: {
+            line: 1,
+            column: 11
+          }
+        }
       },
       body: {
         type: "BlockStatement",
-        start: {line: 1, column: 13},
         body: [
           {
             type: "ContinueStatement",
-            start: {line: 1, column: 15},
             label: null,
-            end: {line: 1, column: 23}
+            loc: {
+              start: {
+                line: 1,
+                column: 15
+              },
+              end: {
+                line: 1,
+                column: 23
+              }
+            }
           }
         ],
-        end: {line: 1, column: 25}
+        loc: {
+          start: {
+            line: 1,
+            column: 13
+          },
+          end: {
+            line: 1,
+            column: 25
+          }
+        }
       },
-      end: {line: 1, column: 25}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 25
+        }
+      }
     }
   ],
-  end: {line: 1, column: 25}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 25
+    }
+  }
 });
 
 test("done: while (true) { continue done }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "LabeledStatement",
-      start: {line: 1, column: 0},
       body: {
         type: "WhileStatement",
-        start: {line: 1, column: 6},
         test: {
           type: "Literal",
-          start: {line: 1, column: 13},
           value: true,
-          end: {line: 1, column: 17}
+          loc: {
+            start: {
+              line: 1,
+              column: 13
+            },
+            end: {
+              line: 1,
+              column: 17
+            }
+          }
         },
         body: {
           type: "BlockStatement",
-          start: {line: 1, column: 19},
           body: [
             {
               type: "ContinueStatement",
-              start: {line: 1, column: 21},
               label: {
                 type: "Identifier",
-                start: {line: 1, column: 30},
                 name: "done",
-                end: {line: 1, column: 34}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 30
+                  },
+                  end: {
+                    line: 1,
+                    column: 34
+                  }
+                }
               },
-              end: {line: 1, column: 34}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 21
+                },
+                end: {
+                  line: 1,
+                  column: 34
+                }
+              }
             }
           ],
-          end: {line: 1, column: 36}
+          loc: {
+            start: {
+              line: 1,
+              column: 19
+            },
+            end: {
+              line: 1,
+              column: 36
+            }
+          }
         },
-        end: {line: 1, column: 36}
+        loc: {
+          start: {
+            line: 1,
+            column: 6
+          },
+          end: {
+            line: 1,
+            column: 36
+          }
+        }
       },
       label: {
         type: "Identifier",
-        start: {line: 1, column: 0},
         name: "done",
-        end: {line: 1, column: 4}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 4
+          }
+        }
       },
-      end: {line: 1, column: 36}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 36
+        }
+      }
     }
   ],
-  end: {line: 1, column: 36}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 36
+    }
+  }
 });
 
 test("done: while (true) { continue done; }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "LabeledStatement",
-      start: {line: 1, column: 0},
       body: {
         type: "WhileStatement",
-        start: {line: 1, column: 6},
         test: {
           type: "Literal",
-          start: {line: 1, column: 13},
           value: true,
-          end: {line: 1, column: 17}
+          loc: {
+            start: {
+              line: 1,
+              column: 13
+            },
+            end: {
+              line: 1,
+              column: 17
+            }
+          }
         },
         body: {
           type: "BlockStatement",
-          start: {line: 1, column: 19},
           body: [
             {
               type: "ContinueStatement",
-              start: {line: 1, column: 21},
               label: {
                 type: "Identifier",
-                start: {line: 1, column: 30},
                 name: "done",
-                end: {line: 1, column: 34}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 30
+                  },
+                  end: {
+                    line: 1,
+                    column: 34
+                  }
+                }
               },
-              end: {line: 1, column: 35}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 21
+                },
+                end: {
+                  line: 1,
+                  column: 35
+                }
+              }
             }
           ],
-          end: {line: 1, column: 37}
+          loc: {
+            start: {
+              line: 1,
+              column: 19
+            },
+            end: {
+              line: 1,
+              column: 37
+            }
+          }
         },
-        end: {line: 1, column: 37}
+        loc: {
+          start: {
+            line: 1,
+            column: 6
+          },
+          end: {
+            line: 1,
+            column: 37
+          }
+        }
       },
       label: {
         type: "Identifier",
-        start: {line: 1, column: 0},
         name: "done",
-        end: {line: 1, column: 4}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 4
+          }
+        }
       },
-      end: {line: 1, column: 37}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 37
+        }
+      }
     }
   ],
-  end: {line: 1, column: 37}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 37
+    }
+  }
 });
 
 test("while (true) { break }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "WhileStatement",
-      start: {line: 1, column: 0},
       test: {
         type: "Literal",
-        start: {line: 1, column: 7},
         value: true,
-        end: {line: 1, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 7
+          },
+          end: {
+            line: 1,
+            column: 11
+          }
+        }
       },
       body: {
         type: "BlockStatement",
-        start: {line: 1, column: 13},
         body: [
           {
             type: "BreakStatement",
-            start: {line: 1, column: 15},
             label: null,
-            end: {line: 1, column: 20}
+            loc: {
+              start: {
+                line: 1,
+                column: 15
+              },
+              end: {
+                line: 1,
+                column: 20
+              }
+            }
           }
         ],
-        end: {line: 1, column: 22}
+        loc: {
+          start: {
+            line: 1,
+            column: 13
+          },
+          end: {
+            line: 1,
+            column: 22
+          }
+        }
       },
-      end: {line: 1, column: 22}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 22
+        }
+      }
     }
   ],
-  end: {line: 1, column: 22}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 22
+    }
+  }
 });
 
 test("done: while (true) { break done }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "LabeledStatement",
-      start: {line: 1, column: 0},
       body: {
         type: "WhileStatement",
-        start: {line: 1, column: 6},
         test: {
           type: "Literal",
-          start: {line: 1, column: 13},
           value: true,
-          end: {line: 1, column: 17}
+          loc: {
+            start: {
+              line: 1,
+              column: 13
+            },
+            end: {
+              line: 1,
+              column: 17
+            }
+          }
         },
         body: {
           type: "BlockStatement",
-          start: {line: 1, column: 19},
           body: [
             {
               type: "BreakStatement",
-              start: {line: 1, column: 21},
               label: {
                 type: "Identifier",
-                start: {line: 1, column: 27},
                 name: "done",
-                end: {line: 1, column: 31}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 27
+                  },
+                  end: {
+                    line: 1,
+                    column: 31
+                  }
+                }
               },
-              end: {line: 1, column: 31}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 21
+                },
+                end: {
+                  line: 1,
+                  column: 31
+                }
+              }
             }
           ],
-          end: {line: 1, column: 33}
+          loc: {
+            start: {
+              line: 1,
+              column: 19
+            },
+            end: {
+              line: 1,
+              column: 33
+            }
+          }
         },
-        end: {line: 1, column: 33}
+        loc: {
+          start: {
+            line: 1,
+            column: 6
+          },
+          end: {
+            line: 1,
+            column: 33
+          }
+        }
       },
       label: {
         type: "Identifier",
-        start: {line: 1, column: 0},
         name: "done",
-        end: {line: 1, column: 4}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 4
+          }
+        }
       },
-      end: {line: 1, column: 33}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 33
+        }
+      }
     }
   ],
-  end: {line: 1, column: 33}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 33
+    }
+  }
 });
 
 test("done: while (true) { break done; }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "LabeledStatement",
-      start: {line: 1, column: 0},
       body: {
         type: "WhileStatement",
-        start: {line: 1, column: 6},
         test: {
           type: "Literal",
-          start: {line: 1, column: 13},
           value: true,
-          end: {line: 1, column: 17}
+          loc: {
+            start: {
+              line: 1,
+              column: 13
+            },
+            end: {
+              line: 1,
+              column: 17
+            }
+          }
         },
         body: {
           type: "BlockStatement",
-          start: {line: 1, column: 19},
           body: [
             {
               type: "BreakStatement",
-              start: {line: 1, column: 21},
               label: {
                 type: "Identifier",
-                start: {line: 1, column: 27},
                 name: "done",
-                end: {line: 1, column: 31}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 27
+                  },
+                  end: {
+                    line: 1,
+                    column: 31
+                  }
+                }
               },
-              end: {line: 1, column: 32}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 21
+                },
+                end: {
+                  line: 1,
+                  column: 32
+                }
+              }
             }
           ],
-          end: {line: 1, column: 34}
+          loc: {
+            start: {
+              line: 1,
+              column: 19
+            },
+            end: {
+              line: 1,
+              column: 34
+            }
+          }
         },
-        end: {line: 1, column: 34}
+        loc: {
+          start: {
+            line: 1,
+            column: 6
+          },
+          end: {
+            line: 1,
+            column: 34
+          }
+        }
       },
       label: {
         type: "Identifier",
-        start: {line: 1, column: 0},
         name: "done",
-        end: {line: 1, column: 4}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 4
+          }
+        }
       },
-      end: {line: 1, column: 34}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 34
+        }
+      }
     }
   ],
-  end: {line: 1, column: 34}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 34
+    }
+  }
 });
 
 test("(function(){ return })", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "FunctionExpression",
-        start: {line: 1, column: 1},
         id: null,
         params: [],
         body: {
           type: "BlockStatement",
-          start: {line: 1, column: 11},
           body: [
             {
               type: "ReturnStatement",
-              start: {line: 1, column: 13},
               argument: null,
-              end: {line: 1, column: 19}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 13
+                },
+                end: {
+                  line: 1,
+                  column: 19
+                }
+              }
             }
           ],
-          end: {line: 1, column: 21}
+          loc: {
+            start: {
+              line: 1,
+              column: 11
+            },
+            end: {
+              line: 1,
+              column: 21
+            }
+          }
         },
-        end: {line: 1, column: 21}
+        loc: {
+          start: {
+            line: 1,
+            column: 1
+          },
+          end: {
+            line: 1,
+            column: 21
+          }
+        }
       },
-      end: {line: 1, column: 22}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 22
+        }
+      }
     }
   ],
-  end: {line: 1, column: 22}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 22
+    }
+  }
 });
 
 test("(function(){ return; })", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "FunctionExpression",
-        start: {line: 1, column: 1},
         id: null,
         params: [],
         body: {
           type: "BlockStatement",
-          start: {line: 1, column: 11},
           body: [
             {
               type: "ReturnStatement",
-              start: {line: 1, column: 13},
               argument: null,
-              end: {line: 1, column: 20}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 13
+                },
+                end: {
+                  line: 1,
+                  column: 20
+                }
+              }
             }
           ],
-          end: {line: 1, column: 22}
+          loc: {
+            start: {
+              line: 1,
+              column: 11
+            },
+            end: {
+              line: 1,
+              column: 22
+            }
+          }
         },
-        end: {line: 1, column: 22}
+        loc: {
+          start: {
+            line: 1,
+            column: 1
+          },
+          end: {
+            line: 1,
+            column: 22
+          }
+        }
       },
-      end: {line: 1, column: 23}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 23
+        }
+      }
     }
   ],
-  end: {line: 1, column: 23}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 23
+    }
+  }
 });
 
 test("(function(){ return x; })", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "FunctionExpression",
-        start: {line: 1, column: 1},
         id: null,
         params: [],
         body: {
           type: "BlockStatement",
-          start: {line: 1, column: 11},
           body: [
             {
               type: "ReturnStatement",
-              start: {line: 1, column: 13},
               argument: {
                 type: "Identifier",
-                start: {line: 1, column: 20},
                 name: "x",
-                end: {line: 1, column: 21}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 20
+                  },
+                  end: {
+                    line: 1,
+                    column: 21
+                  }
+                }
               },
-              end: {line: 1, column: 22}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 13
+                },
+                end: {
+                  line: 1,
+                  column: 22
+                }
+              }
             }
           ],
-          end: {line: 1, column: 24}
+          loc: {
+            start: {
+              line: 1,
+              column: 11
+            },
+            end: {
+              line: 1,
+              column: 24
+            }
+          }
         },
-        end: {line: 1, column: 24}
+        loc: {
+          start: {
+            line: 1,
+            column: 1
+          },
+          end: {
+            line: 1,
+            column: 24
+          }
+        }
       },
-      end: {line: 1, column: 25}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 25
+        }
+      }
     }
   ],
-  end: {line: 1, column: 25}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 25
+    }
+  }
 });
 
 test("(function(){ return x * y })", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "FunctionExpression",
-        start: {line: 1, column: 1},
         id: null,
         params: [],
         body: {
           type: "BlockStatement",
-          start: {line: 1, column: 11},
           body: [
             {
               type: "ReturnStatement",
-              start: {line: 1, column: 13},
               argument: {
                 type: "BinaryExpression",
-                start: {line: 1, column: 20},
                 left: {
                   type: "Identifier",
-                  start: {line: 1, column: 20},
                   name: "x",
-                  end: {line: 1, column: 21}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 20
+                    },
+                    end: {
+                      line: 1,
+                      column: 21
+                    }
+                  }
                 },
                 operator: "*",
                 right: {
                   type: "Identifier",
-                  start: {line: 1, column: 24},
                   name: "y",
-                  end: {line: 1, column: 25}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 24
+                    },
+                    end: {
+                      line: 1,
+                      column: 25
+                    }
+                  }
                 },
-                end: {line: 1, column: 25}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 20
+                  },
+                  end: {
+                    line: 1,
+                    column: 25
+                  }
+                }
               },
-              end: {line: 1, column: 25}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 13
+                },
+                end: {
+                  line: 1,
+                  column: 25
+                }
+              }
             }
           ],
-          end: {line: 1, column: 27}
+          loc: {
+            start: {
+              line: 1,
+              column: 11
+            },
+            end: {
+              line: 1,
+              column: 27
+            }
+          }
         },
-        end: {line: 1, column: 27}
+        loc: {
+          start: {
+            line: 1,
+            column: 1
+          },
+          end: {
+            line: 1,
+            column: 27
+          }
+        }
       },
-      end: {line: 1, column: 28}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 28
+        }
+      }
     }
   ],
-  end: {line: 1, column: 28}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 28
+    }
+  }
 });
 
 test("with (x) foo = bar", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "WithStatement",
-      start: {line: 1, column: 0},
       object: {
         type: "Identifier",
-        start: {line: 1, column: 6},
         name: "x",
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 6
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
       body: {
         type: "ExpressionStatement",
-        start: {line: 1, column: 9},
         expression: {
           type: "AssignmentExpression",
-          start: {line: 1, column: 9},
           operator: "=",
           left: {
             type: "Identifier",
-            start: {line: 1, column: 9},
             name: "foo",
-            end: {line: 1, column: 12}
+            loc: {
+              start: {
+                line: 1,
+                column: 9
+              },
+              end: {
+                line: 1,
+                column: 12
+              }
+            }
           },
           right: {
             type: "Identifier",
-            start: {line: 1, column: 15},
             name: "bar",
-            end: {line: 1, column: 18}
+            loc: {
+              start: {
+                line: 1,
+                column: 15
+              },
+              end: {
+                line: 1,
+                column: 18
+              }
+            }
           },
-          end: {line: 1, column: 18}
+          loc: {
+            start: {
+              line: 1,
+              column: 9
+            },
+            end: {
+              line: 1,
+              column: 18
+            }
+          }
         },
-        end: {line: 1, column: 18}
+        loc: {
+          start: {
+            line: 1,
+            column: 9
+          },
+          end: {
+            line: 1,
+            column: 18
+          }
+        }
       },
-      end: {line: 1, column: 18}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 18
+        }
+      }
     }
   ],
-  end: {line: 1, column: 18}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 18
+    }
+  }
 });
 
 test("with (x) foo = bar;", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "WithStatement",
-      start: {line: 1, column: 0},
       object: {
         type: "Identifier",
-        start: {line: 1, column: 6},
         name: "x",
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 6
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
       body: {
         type: "ExpressionStatement",
-        start: {line: 1, column: 9},
         expression: {
           type: "AssignmentExpression",
-          start: {line: 1, column: 9},
           operator: "=",
           left: {
             type: "Identifier",
-            start: {line: 1, column: 9},
             name: "foo",
-            end: {line: 1, column: 12}
+            loc: {
+              start: {
+                line: 1,
+                column: 9
+              },
+              end: {
+                line: 1,
+                column: 12
+              }
+            }
           },
           right: {
             type: "Identifier",
-            start: {line: 1, column: 15},
             name: "bar",
-            end: {line: 1, column: 18}
+            loc: {
+              start: {
+                line: 1,
+                column: 15
+              },
+              end: {
+                line: 1,
+                column: 18
+              }
+            }
           },
-          end: {line: 1, column: 18}
+          loc: {
+            start: {
+              line: 1,
+              column: 9
+            },
+            end: {
+              line: 1,
+              column: 18
+            }
+          }
         },
-        end: {line: 1, column: 19}
+        loc: {
+          start: {
+            line: 1,
+            column: 9
+          },
+          end: {
+            line: 1,
+            column: 19
+          }
+        }
       },
-      end: {line: 1, column: 19}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 19
+        }
+      }
     }
   ],
-  end: {line: 1, column: 19}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 19
+    }
+  }
 });
 
 test("with (x) { foo = bar }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "WithStatement",
-      start: {line: 1, column: 0},
       object: {
         type: "Identifier",
-        start: {line: 1, column: 6},
         name: "x",
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 6
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
       body: {
         type: "BlockStatement",
-        start: {line: 1, column: 9},
         body: [
           {
             type: "ExpressionStatement",
-            start: {line: 1, column: 11},
             expression: {
               type: "AssignmentExpression",
-              start: {line: 1, column: 11},
               operator: "=",
               left: {
                 type: "Identifier",
-                start: {line: 1, column: 11},
                 name: "foo",
-                end: {line: 1, column: 14}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 11
+                  },
+                  end: {
+                    line: 1,
+                    column: 14
+                  }
+                }
               },
               right: {
                 type: "Identifier",
-                start: {line: 1, column: 17},
                 name: "bar",
-                end: {line: 1, column: 20}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 17
+                  },
+                  end: {
+                    line: 1,
+                    column: 20
+                  }
+                }
               },
-              end: {line: 1, column: 20}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 11
+                },
+                end: {
+                  line: 1,
+                  column: 20
+                }
+              }
             },
-            end: {line: 1, column: 20}
+            loc: {
+              start: {
+                line: 1,
+                column: 11
+              },
+              end: {
+                line: 1,
+                column: 20
+              }
+            }
           }
         ],
-        end: {line: 1, column: 22}
+        loc: {
+          start: {
+            line: 1,
+            column: 9
+          },
+          end: {
+            line: 1,
+            column: 22
+          }
+        }
       },
-      end: {line: 1, column: 22}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 22
+        }
+      }
     }
   ],
-  end: {line: 1, column: 22}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 22
+    }
+  }
 });
 
 test("switch (x) {}", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "SwitchStatement",
-      start: {line: 1, column: 0},
       discriminant: {
         type: "Identifier",
-        start: {line: 1, column: 8},
         name: "x",
-        end: {line: 1, column: 9}
+        loc: {
+          start: {
+            line: 1,
+            column: 8
+          },
+          end: {
+            line: 1,
+            column: 9
+          }
+        }
       },
       cases: [],
-      end: {line: 1, column: 13}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 13
+        }
+      }
     }
   ],
-  end: {line: 1, column: 13}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 13
+    }
+  }
 });
 
 test("switch (answer) { case 42: hi(); break; }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "SwitchStatement",
-      start: {line: 1, column: 0},
       discriminant: {
         type: "Identifier",
-        start: {line: 1, column: 8},
         name: "answer",
-        end: {line: 1, column: 14}
+        loc: {
+          start: {
+            line: 1,
+            column: 8
+          },
+          end: {
+            line: 1,
+            column: 14
+          }
+        }
       },
       cases: [
         {
           type: "SwitchCase",
-          start: {line: 1, column: 18},
           consequent: [
             {
               type: "ExpressionStatement",
-              start: {line: 1, column: 27},
               expression: {
                 type: "CallExpression",
-                start: {line: 1, column: 27},
                 callee: {
                   type: "Identifier",
-                  start: {line: 1, column: 27},
                   name: "hi",
-                  end: {line: 1, column: 29}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 27
+                    },
+                    end: {
+                      line: 1,
+                      column: 29
+                    }
+                  }
                 },
                 arguments: [],
-                end: {line: 1, column: 31}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 27
+                  },
+                  end: {
+                    line: 1,
+                    column: 31
+                  }
+                }
               },
-              end: {line: 1, column: 32}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 27
+                },
+                end: {
+                  line: 1,
+                  column: 32
+                }
+              }
             },
             {
               type: "BreakStatement",
-              start: {line: 1, column: 33},
               label: null,
-              end: {line: 1, column: 39}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 33
+                },
+                end: {
+                  line: 1,
+                  column: 39
+                }
+              }
             }
           ],
           test: {
             type: "Literal",
-            start: {line: 1, column: 23},
             value: 42,
-            end: {line: 1, column: 25}
+            loc: {
+              start: {
+                line: 1,
+                column: 23
+              },
+              end: {
+                line: 1,
+                column: 25
+              }
+            }
           },
-          end: {line: 1, column: 39}
+          loc: {
+            start: {
+              line: 1,
+              column: 18
+            },
+            end: {
+              line: 1,
+              column: 39
+            }
+          }
         }
       ],
-      end: {line: 1, column: 41}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 41
+        }
+      }
     }
   ],
-  end: {line: 1, column: 41}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 41
+    }
+  }
 });
 
 test("switch (answer) { case 42: hi(); break; default: break }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "SwitchStatement",
-      start: {line: 1, column: 0},
       discriminant: {
         type: "Identifier",
-        start: {line: 1, column: 8},
         name: "answer",
-        end: {line: 1, column: 14}
+        loc: {
+          start: {
+            line: 1,
+            column: 8
+          },
+          end: {
+            line: 1,
+            column: 14
+          }
+        }
       },
       cases: [
         {
           type: "SwitchCase",
-          start: {line: 1, column: 18},
           consequent: [
             {
               type: "ExpressionStatement",
-              start: {line: 1, column: 27},
               expression: {
                 type: "CallExpression",
-                start: {line: 1, column: 27},
                 callee: {
                   type: "Identifier",
-                  start: {line: 1, column: 27},
                   name: "hi",
-                  end: {line: 1, column: 29}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 27
+                    },
+                    end: {
+                      line: 1,
+                      column: 29
+                    }
+                  }
                 },
                 arguments: [],
-                end: {line: 1, column: 31}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 27
+                  },
+                  end: {
+                    line: 1,
+                    column: 31
+                  }
+                }
               },
-              end: {line: 1, column: 32}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 27
+                },
+                end: {
+                  line: 1,
+                  column: 32
+                }
+              }
             },
             {
               type: "BreakStatement",
-              start: {line: 1, column: 33},
               label: null,
-              end: {line: 1, column: 39}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 33
+                },
+                end: {
+                  line: 1,
+                  column: 39
+                }
+              }
             }
           ],
           test: {
             type: "Literal",
-            start: {line: 1, column: 23},
             value: 42,
-            end: {line: 1, column: 25}
+            loc: {
+              start: {
+                line: 1,
+                column: 23
+              },
+              end: {
+                line: 1,
+                column: 25
+              }
+            }
           },
-          end: {line: 1, column: 39}
+          loc: {
+            start: {
+              line: 1,
+              column: 18
+            },
+            end: {
+              line: 1,
+              column: 39
+            }
+          }
         },
         {
           type: "SwitchCase",
-          start: {line: 1, column: 40},
           consequent: [
             {
               type: "BreakStatement",
-              start: {line: 1, column: 49},
               label: null,
-              end: {line: 1, column: 54}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 49
+                },
+                end: {
+                  line: 1,
+                  column: 54
+                }
+              }
             }
           ],
           test: null,
-          end: {line: 1, column: 54}
+          loc: {
+            start: {
+              line: 1,
+              column: 40
+            },
+            end: {
+              line: 1,
+              column: 54
+            }
+          }
         }
       ],
-      end: {line: 1, column: 56}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 56
+        }
+      }
     }
   ],
-  end: {line: 1, column: 56}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 56
+    }
+  }
 });
 
 test("start: for (;;) break start", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "LabeledStatement",
-      start: {line: 1, column: 0},
       body: {
         type: "ForStatement",
-        start: {line: 1, column: 7},
         init: null,
         test: null,
         update: null,
         body: {
           type: "BreakStatement",
-          start: {line: 1, column: 16},
           label: {
             type: "Identifier",
-            start: {line: 1, column: 22},
             name: "start",
-            end: {line: 1, column: 27}
+            loc: {
+              start: {
+                line: 1,
+                column: 22
+              },
+              end: {
+                line: 1,
+                column: 27
+              }
+            }
           },
-          end: {line: 1, column: 27}
+          loc: {
+            start: {
+              line: 1,
+              column: 16
+            },
+            end: {
+              line: 1,
+              column: 27
+            }
+          }
         },
-        end: {line: 1, column: 27}
+        loc: {
+          start: {
+            line: 1,
+            column: 7
+          },
+          end: {
+            line: 1,
+            column: 27
+          }
+        }
       },
       label: {
         type: "Identifier",
-        start: {line: 1, column: 0},
         name: "start",
-        end: {line: 1, column: 5}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 5
+          }
+        }
       },
-      end: {line: 1, column: 27}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 27
+        }
+      }
     }
   ],
-  end: {line: 1, column: 27}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 27
+    }
+  }
 });
 
 test("start: while (true) break start", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "LabeledStatement",
-      start: {line: 1, column: 0},
       body: {
         type: "WhileStatement",
-        start: {line: 1, column: 7},
         test: {
           type: "Literal",
-          start: {line: 1, column: 14},
           value: true,
-          end: {line: 1, column: 18}
+          loc: {
+            start: {
+              line: 1,
+              column: 14
+            },
+            end: {
+              line: 1,
+              column: 18
+            }
+          }
         },
         body: {
           type: "BreakStatement",
-          start: {line: 1, column: 20},
           label: {
             type: "Identifier",
-            start: {line: 1, column: 26},
             name: "start",
-            end: {line: 1, column: 31}
+            loc: {
+              start: {
+                line: 1,
+                column: 26
+              },
+              end: {
+                line: 1,
+                column: 31
+              }
+            }
           },
-          end: {line: 1, column: 31}
+          loc: {
+            start: {
+              line: 1,
+              column: 20
+            },
+            end: {
+              line: 1,
+              column: 31
+            }
+          }
         },
-        end: {line: 1, column: 31}
+        loc: {
+          start: {
+            line: 1,
+            column: 7
+          },
+          end: {
+            line: 1,
+            column: 31
+          }
+        }
       },
       label: {
         type: "Identifier",
-        start: {line: 1, column: 0},
         name: "start",
-        end: {line: 1, column: 5}
+        loc: {
+          start: {
+            line: 1,
+            column: 0
+          },
+          end: {
+            line: 1,
+            column: 5
+          }
+        }
       },
-      end: {line: 1, column: 31}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 31
+        }
+      }
     }
   ],
-  end: {line: 1, column: 31}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 31
+    }
+  }
 });
 
 test("throw x;", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ThrowStatement",
-      start: {line: 1, column: 0},
       argument: {
         type: "Identifier",
-        start: {line: 1, column: 6},
         name: "x",
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 6
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
-      end: {line: 1, column: 7}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 7
+        }
+      }
     },
     {
       type: "EmptyStatement",
-      start: {line: 1, column: 7},
-      end: {line: 1, column: 8}
+      loc: {
+        start: {
+          line: 1,
+          column: 7
+        },
+        end: {
+          line: 1,
+          column: 8
+        }
+      }
     }
   ],
-  end: {line: 1, column: 8}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 8
+    }
+  }
 });
 
 test("throw x * y", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ThrowStatement",
-      start: {line: 1, column: 0},
       argument: {
         type: "BinaryExpression",
-        start: {line: 1, column: 6},
         left: {
           type: "Identifier",
-          start: {line: 1, column: 6},
           name: "x",
-          end: {line: 1, column: 7}
+          loc: {
+            start: {
+              line: 1,
+              column: 6
+            },
+            end: {
+              line: 1,
+              column: 7
+            }
+          }
         },
         operator: "*",
         right: {
           type: "Identifier",
-          start: {line: 1, column: 10},
           name: "y",
-          end: {line: 1, column: 11}
+          loc: {
+            start: {
+              line: 1,
+              column: 10
+            },
+            end: {
+              line: 1,
+              column: 11
+            }
+          }
         },
-        end: {line: 1, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 6
+          },
+          end: {
+            line: 1,
+            column: 11
+          }
+        }
       },
-      end: {line: 1, column: 11}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 11
+        }
+      }
     }
   ],
-  end: {line: 1, column: 11}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 11
+    }
+  }
 });
 
 test("throw { message: \"Error\" }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ThrowStatement",
-      start: {line: 1, column: 0},
       argument: {
         type: "ObjectExpression",
-        start: {line: 1, column: 6},
         properties: [
           {
             key: {
               type: "Identifier",
-              start: {line: 1, column: 8},
               name: "message",
-              end: {line: 1, column: 15}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 8
+                },
+                end: {
+                  line: 1,
+                  column: 15
+                }
+              }
             },
             value: {
               type: "Literal",
-              start: {line: 1, column: 17},
               value: "Error",
-              end: {line: 1, column: 24}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 17
+                },
+                end: {
+                  line: 1,
+                  column: 24
+                }
+              }
             },
             kind: "init"
           }
         ],
-        end: {line: 1, column: 26}
+        loc: {
+          start: {
+            line: 1,
+            column: 6
+          },
+          end: {
+            line: 1,
+            column: 26
+          }
+        }
       },
-      end: {line: 1, column: 26}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 26
+        }
+      }
     }
   ],
-  end: {line: 1, column: 26}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 26
+    }
+  }
 });
 
 test("try { } catch (e) { }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "TryStatement",
-      start: {line: 1, column: 0},
       block: {
         type: "BlockStatement",
-        start: {line: 1, column: 4},
         body: [],
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 4
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
       handlers: [
         {
           type: "CatchClause",
-          start: {line: 1, column: 8},
           param: {
             type: "Identifier",
-            start: {line: 1, column: 15},
             name: "e",
-            end: {line: 1, column: 16}
+            loc: {
+              start: {
+                line: 1,
+                column: 15
+              },
+              end: {
+                line: 1,
+                column: 16
+              }
+            }
           },
           guard: null,
           body: {
             type: "BlockStatement",
-            start: {line: 1, column: 18},
             body: [],
-            end: {line: 1, column: 21}
+            loc: {
+              start: {
+                line: 1,
+                column: 18
+              },
+              end: {
+                line: 1,
+                column: 21
+              }
+            }
           },
-          end: {line: 1, column: 21}
+          loc: {
+            start: {
+              line: 1,
+              column: 8
+            },
+            end: {
+              line: 1,
+              column: 21
+            }
+          }
         }
       ],
       finalizer: null,
-      end: {line: 1, column: 21}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 21
+        }
+      }
     }
   ],
-  end: {line: 1, column: 21}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 21
+    }
+  }
 });
 
 test("try { } catch (eval) { }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "TryStatement",
-      start: {line: 1, column: 0},
       block: {
         type: "BlockStatement",
-        start: {line: 1, column: 4},
         body: [],
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 4
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
       handlers: [
         {
           type: "CatchClause",
-          start: {line: 1, column: 8},
           param: {
             type: "Identifier",
-            start: {line: 1, column: 15},
             name: "eval",
-            end: {line: 1, column: 19}
+            loc: {
+              start: {
+                line: 1,
+                column: 15
+              },
+              end: {
+                line: 1,
+                column: 19
+              }
+            }
           },
           guard: null,
           body: {
             type: "BlockStatement",
-            start: {line: 1, column: 21},
             body: [],
-            end: {line: 1, column: 24}
+            loc: {
+              start: {
+                line: 1,
+                column: 21
+              },
+              end: {
+                line: 1,
+                column: 24
+              }
+            }
           },
-          end: {line: 1, column: 24}
+          loc: {
+            start: {
+              line: 1,
+              column: 8
+            },
+            end: {
+              line: 1,
+              column: 24
+            }
+          }
         }
       ],
       finalizer: null,
-      end: {line: 1, column: 24}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 24
+        }
+      }
     }
   ],
-  end: {line: 1, column: 24}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 24
+    }
+  }
 });
 
 test("try { } catch (arguments) { }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "TryStatement",
-      start: {line: 1, column: 0},
       block: {
         type: "BlockStatement",
-        start: {line: 1, column: 4},
         body: [],
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 4
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
       handlers: [
         {
           type: "CatchClause",
-          start: {line: 1, column: 8},
           param: {
             type: "Identifier",
-            start: {line: 1, column: 15},
             name: "arguments",
-            end: {line: 1, column: 24}
+            loc: {
+              start: {
+                line: 1,
+                column: 15
+              },
+              end: {
+                line: 1,
+                column: 24
+              }
+            }
           },
           guard: null,
           body: {
             type: "BlockStatement",
-            start: {line: 1, column: 26},
             body: [],
-            end: {line: 1, column: 29}
+            loc: {
+              start: {
+                line: 1,
+                column: 26
+              },
+              end: {
+                line: 1,
+                column: 29
+              }
+            }
           },
-          end: {line: 1, column: 29}
+          loc: {
+            start: {
+              line: 1,
+              column: 8
+            },
+            end: {
+              line: 1,
+              column: 29
+            }
+          }
         }
       ],
       finalizer: null,
-      end: {line: 1, column: 29}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 29
+        }
+      }
     }
   ],
-  end: {line: 1, column: 29}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 29
+    }
+  }
 });
 
 test("try { } catch (e) { say(e) }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "TryStatement",
-      start: {line: 1, column: 0},
       block: {
         type: "BlockStatement",
-        start: {line: 1, column: 4},
         body: [],
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 4
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
       handlers: [
         {
           type: "CatchClause",
-          start: {line: 1, column: 8},
           param: {
             type: "Identifier",
-            start: {line: 1, column: 15},
             name: "e",
-            end: {line: 1, column: 16}
+            loc: {
+              start: {
+                line: 1,
+                column: 15
+              },
+              end: {
+                line: 1,
+                column: 16
+              }
+            }
           },
           guard: null,
           body: {
             type: "BlockStatement",
-            start: {line: 1, column: 18},
             body: [
               {
                 type: "ExpressionStatement",
-                start: {line: 1, column: 20},
                 expression: {
                   type: "CallExpression",
-                  start: {line: 1, column: 20},
                   callee: {
                     type: "Identifier",
-                    start: {line: 1, column: 20},
                     name: "say",
-                    end: {line: 1, column: 23}
+                    loc: {
+                      start: {
+                        line: 1,
+                        column: 20
+                      },
+                      end: {
+                        line: 1,
+                        column: 23
+                      }
+                    }
                   },
                   arguments: [
                     {
                       type: "Identifier",
-                      start: {line: 1, column: 24},
                       name: "e",
-                      end: {line: 1, column: 25}
+                      loc: {
+                        start: {
+                          line: 1,
+                          column: 24
+                        },
+                        end: {
+                          line: 1,
+                          column: 25
+                        }
+                      }
                     }
                   ],
-                  end: {line: 1, column: 26}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 20
+                    },
+                    end: {
+                      line: 1,
+                      column: 26
+                    }
+                  }
                 },
-                end: {line: 1, column: 26}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 20
+                  },
+                  end: {
+                    line: 1,
+                    column: 26
+                  }
+                }
               }
             ],
-            end: {line: 1, column: 28}
+            loc: {
+              start: {
+                line: 1,
+                column: 18
+              },
+              end: {
+                line: 1,
+                column: 28
+              }
+            }
           },
-          end: {line: 1, column: 28}
+          loc: {
+            start: {
+              line: 1,
+              column: 8
+            },
+            end: {
+              line: 1,
+              column: 28
+            }
+          }
         }
       ],
       finalizer: null,
-      end: {line: 1, column: 28}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 28
+        }
+      }
     }
   ],
-  end: {line: 1, column: 28}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 28
+    }
+  }
 });
 
 test("try { } finally { cleanup(stuff) }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "TryStatement",
-      start: {line: 1, column: 0},
       block: {
         type: "BlockStatement",
-        start: {line: 1, column: 4},
         body: [],
-        end: {line: 1, column: 7}
+        loc: {
+          start: {
+            line: 1,
+            column: 4
+          },
+          end: {
+            line: 1,
+            column: 7
+          }
+        }
       },
       handlers: [],
       finalizer: {
         type: "BlockStatement",
-        start: {line: 1, column: 16},
         body: [
           {
             type: "ExpressionStatement",
-            start: {line: 1, column: 18},
             expression: {
               type: "CallExpression",
-              start: {line: 1, column: 18},
               callee: {
                 type: "Identifier",
-                start: {line: 1, column: 18},
                 name: "cleanup",
-                end: {line: 1, column: 25}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 18
+                  },
+                  end: {
+                    line: 1,
+                    column: 25
+                  }
+                }
               },
               arguments: [
                 {
                   type: "Identifier",
-                  start: {line: 1, column: 26},
                   name: "stuff",
-                  end: {line: 1, column: 31}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 26
+                    },
+                    end: {
+                      line: 1,
+                      column: 31
+                    }
+                  }
                 }
               ],
-              end: {line: 1, column: 32}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 18
+                },
+                end: {
+                  line: 1,
+                  column: 32
+                }
+              }
             },
-            end: {line: 1, column: 32}
+            loc: {
+              start: {
+                line: 1,
+                column: 18
+              },
+              end: {
+                line: 1,
+                column: 32
+              }
+            }
           }
         ],
-        end: {line: 1, column: 34}
+        loc: {
+          start: {
+            line: 1,
+            column: 16
+          },
+          end: {
+            line: 1,
+            column: 34
+          }
+        }
       },
-      end: {line: 1, column: 34}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 34
+        }
+      }
     }
   ],
-  end: {line: 1, column: 34}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 34
+    }
+  }
 });
 
 test("try { doThat(); } catch (e) { say(e) }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "TryStatement",
-      start: {line: 1, column: 0},
       block: {
         type: "BlockStatement",
-        start: {line: 1, column: 4},
         body: [
           {
             type: "ExpressionStatement",
-            start: {line: 1, column: 6},
             expression: {
               type: "CallExpression",
-              start: {line: 1, column: 6},
               callee: {
                 type: "Identifier",
-                start: {line: 1, column: 6},
                 name: "doThat",
-                end: {line: 1, column: 12}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 6
+                  },
+                  end: {
+                    line: 1,
+                    column: 12
+                  }
+                }
               },
               arguments: [],
-              end: {line: 1, column: 14}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 6
+                },
+                end: {
+                  line: 1,
+                  column: 14
+                }
+              }
             },
-            end: {line: 1, column: 15}
+            loc: {
+              start: {
+                line: 1,
+                column: 6
+              },
+              end: {
+                line: 1,
+                column: 15
+              }
+            }
           }
         ],
-        end: {line: 1, column: 17}
+        loc: {
+          start: {
+            line: 1,
+            column: 4
+          },
+          end: {
+            line: 1,
+            column: 17
+          }
+        }
       },
       handlers: [
         {
           type: "CatchClause",
-          start: {line: 1, column: 18},
           param: {
             type: "Identifier",
-            start: {line: 1, column: 25},
             name: "e",
-            end: {line: 1, column: 26}
+            loc: {
+              start: {
+                line: 1,
+                column: 25
+              },
+              end: {
+                line: 1,
+                column: 26
+              }
+            }
           },
           guard: null,
           body: {
             type: "BlockStatement",
-            start: {line: 1, column: 28},
             body: [
               {
                 type: "ExpressionStatement",
-                start: {line: 1, column: 30},
                 expression: {
                   type: "CallExpression",
-                  start: {line: 1, column: 30},
                   callee: {
                     type: "Identifier",
-                    start: {line: 1, column: 30},
                     name: "say",
-                    end: {line: 1, column: 33}
+                    loc: {
+                      start: {
+                        line: 1,
+                        column: 30
+                      },
+                      end: {
+                        line: 1,
+                        column: 33
+                      }
+                    }
                   },
                   arguments: [
                     {
                       type: "Identifier",
-                      start: {line: 1, column: 34},
                       name: "e",
-                      end: {line: 1, column: 35}
+                      loc: {
+                        start: {
+                          line: 1,
+                          column: 34
+                        },
+                        end: {
+                          line: 1,
+                          column: 35
+                        }
+                      }
                     }
                   ],
-                  end: {line: 1, column: 36}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 30
+                    },
+                    end: {
+                      line: 1,
+                      column: 36
+                    }
+                  }
                 },
-                end: {line: 1, column: 36}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 30
+                  },
+                  end: {
+                    line: 1,
+                    column: 36
+                  }
+                }
               }
             ],
-            end: {line: 1, column: 38}
+            loc: {
+              start: {
+                line: 1,
+                column: 28
+              },
+              end: {
+                line: 1,
+                column: 38
+              }
+            }
           },
-          end: {line: 1, column: 38}
+          loc: {
+            start: {
+              line: 1,
+              column: 18
+            },
+            end: {
+              line: 1,
+              column: 38
+            }
+          }
         }
       ],
       finalizer: null,
-      end: {line: 1, column: 38}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 38
+        }
+      }
     }
   ],
-  end: {line: 1, column: 38}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 38
+    }
+  }
 });
 
 test("try { doThat(); } catch (e) { say(e) } finally { cleanup(stuff) }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "TryStatement",
-      start: {line: 1, column: 0},
       block: {
         type: "BlockStatement",
-        start: {line: 1, column: 4},
         body: [
           {
             type: "ExpressionStatement",
-            start: {line: 1, column: 6},
             expression: {
               type: "CallExpression",
-              start: {line: 1, column: 6},
               callee: {
                 type: "Identifier",
-                start: {line: 1, column: 6},
                 name: "doThat",
-                end: {line: 1, column: 12}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 6
+                  },
+                  end: {
+                    line: 1,
+                    column: 12
+                  }
+                }
               },
               arguments: [],
-              end: {line: 1, column: 14}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 6
+                },
+                end: {
+                  line: 1,
+                  column: 14
+                }
+              }
             },
-            end: {line: 1, column: 15}
+            loc: {
+              start: {
+                line: 1,
+                column: 6
+              },
+              end: {
+                line: 1,
+                column: 15
+              }
+            }
           }
         ],
-        end: {line: 1, column: 17}
+        loc: {
+          start: {
+            line: 1,
+            column: 4
+          },
+          end: {
+            line: 1,
+            column: 17
+          }
+        }
       },
       handlers: [
         {
           type: "CatchClause",
-          start: {line: 1, column: 18},
           param: {
             type: "Identifier",
-            start: {line: 1, column: 25},
             name: "e",
-            end: {line: 1, column: 26}
+            loc: {
+              start: {
+                line: 1,
+                column: 25
+              },
+              end: {
+                line: 1,
+                column: 26
+              }
+            }
           },
           guard: null,
           body: {
             type: "BlockStatement",
-            start: {line: 1, column: 28},
             body: [
               {
                 type: "ExpressionStatement",
-                start: {line: 1, column: 30},
                 expression: {
                   type: "CallExpression",
-                  start: {line: 1, column: 30},
                   callee: {
                     type: "Identifier",
-                    start: {line: 1, column: 30},
                     name: "say",
-                    end: {line: 1, column: 33}
+                    loc: {
+                      start: {
+                        line: 1,
+                        column: 30
+                      },
+                      end: {
+                        line: 1,
+                        column: 33
+                      }
+                    }
                   },
                   arguments: [
                     {
                       type: "Identifier",
-                      start: {line: 1, column: 34},
                       name: "e",
-                      end: {line: 1, column: 35}
+                      loc: {
+                        start: {
+                          line: 1,
+                          column: 34
+                        },
+                        end: {
+                          line: 1,
+                          column: 35
+                        }
+                      }
                     }
                   ],
-                  end: {line: 1, column: 36}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 30
+                    },
+                    end: {
+                      line: 1,
+                      column: 36
+                    }
+                  }
                 },
-                end: {line: 1, column: 36}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 30
+                  },
+                  end: {
+                    line: 1,
+                    column: 36
+                  }
+                }
               }
             ],
-            end: {line: 1, column: 38}
+            loc: {
+              start: {
+                line: 1,
+                column: 28
+              },
+              end: {
+                line: 1,
+                column: 38
+              }
+            }
           },
-          end: {line: 1, column: 38}
+          loc: {
+            start: {
+              line: 1,
+              column: 18
+            },
+            end: {
+              line: 1,
+              column: 38
+            }
+          }
         }
       ],
       finalizer: {
         type: "BlockStatement",
-        start: {line: 1, column: 47},
         body: [
           {
             type: "ExpressionStatement",
-            start: {line: 1, column: 49},
             expression: {
               type: "CallExpression",
-              start: {line: 1, column: 49},
               callee: {
                 type: "Identifier",
-                start: {line: 1, column: 49},
                 name: "cleanup",
-                end: {line: 1, column: 56}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 49
+                  },
+                  end: {
+                    line: 1,
+                    column: 56
+                  }
+                }
               },
               arguments: [
                 {
                   type: "Identifier",
-                  start: {line: 1, column: 57},
                   name: "stuff",
-                  end: {line: 1, column: 62}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 57
+                    },
+                    end: {
+                      line: 1,
+                      column: 62
+                    }
+                  }
                 }
               ],
-              end: {line: 1, column: 63}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 49
+                },
+                end: {
+                  line: 1,
+                  column: 63
+                }
+              }
             },
-            end: {line: 1, column: 63}
+            loc: {
+              start: {
+                line: 1,
+                column: 49
+              },
+              end: {
+                line: 1,
+                column: 63
+              }
+            }
           }
         ],
-        end: {line: 1, column: 65}
+        loc: {
+          start: {
+            line: 1,
+            column: 47
+          },
+          end: {
+            line: 1,
+            column: 65
+          }
+        }
       },
-      end: {line: 1, column: 65}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 65
+        }
+      }
     }
   ],
-  end: {line: 1, column: 65}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 65
+    }
+  }
 });
 
 test("debugger;", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "DebuggerStatement",
-      start: {line: 1, column: 0},
-      end: {line: 1, column: 8}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 8
+        }
+      }
     },
     {
       type: "EmptyStatement",
-      start: {line: 1, column: 8},
-      end: {line: 1, column: 9}
+      loc: {
+        start: {
+          line: 1,
+          column: 8
+        },
+        end: {
+          line: 1,
+          column: 9
+        }
+      }
     }
   ],
-  end: {line: 1, column: 9}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 9
+    }
+  }
 });
 
 test("function hello() { sayHi(); }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "FunctionDeclaration",
-      start: {line: 1, column: 0},
       id: {
         type: "Identifier",
-        start: {line: 1, column: 9},
         name: "hello",
-        end: {line: 1, column: 14}
+        loc: {
+          start: {
+            line: 1,
+            column: 9
+          },
+          end: {
+            line: 1,
+            column: 14
+          }
+        }
       },
       params: [],
       body: {
         type: "BlockStatement",
-        start: {line: 1, column: 17},
         body: [
           {
             type: "ExpressionStatement",
-            start: {line: 1, column: 19},
             expression: {
               type: "CallExpression",
-              start: {line: 1, column: 19},
               callee: {
                 type: "Identifier",
-                start: {line: 1, column: 19},
                 name: "sayHi",
-                end: {line: 1, column: 24}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 19
+                  },
+                  end: {
+                    line: 1,
+                    column: 24
+                  }
+                }
               },
               arguments: [],
-              end: {line: 1, column: 26}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 19
+                },
+                end: {
+                  line: 1,
+                  column: 26
+                }
+              }
             },
-            end: {line: 1, column: 27}
+            loc: {
+              start: {
+                line: 1,
+                column: 19
+              },
+              end: {
+                line: 1,
+                column: 27
+              }
+            }
           }
         ],
-        end: {line: 1, column: 29}
+        loc: {
+          start: {
+            line: 1,
+            column: 17
+          },
+          end: {
+            line: 1,
+            column: 29
+          }
+        }
       },
-      end: {line: 1, column: 29}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 29
+        }
+      }
     }
   ],
-  end: {line: 1, column: 29}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 29
+    }
+  }
 });
 
 test("function eval() { }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "FunctionDeclaration",
-      start: {line: 1, column: 0},
       id: {
         type: "Identifier",
-        start: {line: 1, column: 9},
         name: "eval",
-        end: {line: 1, column: 13}
+        loc: {
+          start: {
+            line: 1,
+            column: 9
+          },
+          end: {
+            line: 1,
+            column: 13
+          }
+        }
       },
       params: [],
       body: {
         type: "BlockStatement",
-        start: {line: 1, column: 16},
         body: [],
-        end: {line: 1, column: 19}
+        loc: {
+          start: {
+            line: 1,
+            column: 16
+          },
+          end: {
+            line: 1,
+            column: 19
+          }
+        }
       },
-      end: {line: 1, column: 19}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 19
+        }
+      }
     }
   ],
-  end: {line: 1, column: 19}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 19
+    }
+  }
 });
 
 test("function arguments() { }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "FunctionDeclaration",
-      start: {line: 1, column: 0},
       id: {
         type: "Identifier",
-        start: {line: 1, column: 9},
         name: "arguments",
-        end: {line: 1, column: 18}
+        loc: {
+          start: {
+            line: 1,
+            column: 9
+          },
+          end: {
+            line: 1,
+            column: 18
+          }
+        }
       },
       params: [],
       body: {
         type: "BlockStatement",
-        start: {line: 1, column: 21},
         body: [],
-        end: {line: 1, column: 24}
+        loc: {
+          start: {
+            line: 1,
+            column: 21
+          },
+          end: {
+            line: 1,
+            column: 24
+          }
+        }
       },
-      end: {line: 1, column: 24}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 24
+        }
+      }
     }
   ],
-  end: {line: 1, column: 24}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 24
+    }
+  }
 });
 
 test("function test(t, t) { }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "FunctionDeclaration",
-      start: {line: 1, column: 0},
       id: {
         type: "Identifier",
-        start: {line: 1, column: 9},
         name: "test",
-        end: {line: 1, column: 13}
+        loc: {
+          start: {
+            line: 1,
+            column: 9
+          },
+          end: {
+            line: 1,
+            column: 13
+          }
+        }
       },
       params: [
         {
           type: "Identifier",
-          start: {line: 1, column: 14},
           name: "t",
-          end: {line: 1, column: 15}
+          loc: {
+            start: {
+              line: 1,
+              column: 14
+            },
+            end: {
+              line: 1,
+              column: 15
+            }
+          }
         },
         {
           type: "Identifier",
-          start: {line: 1, column: 17},
           name: "t",
-          end: {line: 1, column: 18}
+          loc: {
+            start: {
+              line: 1,
+              column: 17
+            },
+            end: {
+              line: 1,
+              column: 18
+            }
+          }
         }
       ],
       body: {
         type: "BlockStatement",
-        start: {line: 1, column: 20},
         body: [],
-        end: {line: 1, column: 23}
+        loc: {
+          start: {
+            line: 1,
+            column: 20
+          },
+          end: {
+            line: 1,
+            column: 23
+          }
+        }
       },
-      end: {line: 1, column: 23}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 23
+        }
+      }
     }
   ],
-  end: {line: 1, column: 23}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 23
+    }
+  }
 });
 
 test("(function test(t, t) { })", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "FunctionExpression",
-        start: {line: 1, column: 1},
         id: {
           type: "Identifier",
-          start: {line: 1, column: 10},
           name: "test",
-          end: {line: 1, column: 14}
+          loc: {
+            start: {
+              line: 1,
+              column: 10
+            },
+            end: {
+              line: 1,
+              column: 14
+            }
+          }
         },
         params: [
           {
             type: "Identifier",
-            start: {line: 1, column: 15},
             name: "t",
-            end: {line: 1, column: 16}
+            loc: {
+              start: {
+                line: 1,
+                column: 15
+              },
+              end: {
+                line: 1,
+                column: 16
+              }
+            }
           },
           {
             type: "Identifier",
-            start: {line: 1, column: 18},
             name: "t",
-            end: {line: 1, column: 19}
+            loc: {
+              start: {
+                line: 1,
+                column: 18
+              },
+              end: {
+                line: 1,
+                column: 19
+              }
+            }
           }
         ],
         body: {
           type: "BlockStatement",
-          start: {line: 1, column: 21},
           body: [],
-          end: {line: 1, column: 24}
+          loc: {
+            start: {
+              line: 1,
+              column: 21
+            },
+            end: {
+              line: 1,
+              column: 24
+            }
+          }
         },
-        end: {line: 1, column: 24}
+        loc: {
+          start: {
+            line: 1,
+            column: 1
+          },
+          end: {
+            line: 1,
+            column: 24
+          }
+        }
       },
-      end: {line: 1, column: 25}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 25
+        }
+      }
     }
   ],
-  end: {line: 1, column: 25}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 25
+    }
+  }
 });
 
 test("function eval() { function inner() { \"use strict\" } }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "FunctionDeclaration",
-      start: {line: 1, column: 0},
       id: {
         type: "Identifier",
-        start: {line: 1, column: 9},
         name: "eval",
-        end: {line: 1, column: 13}
+        loc: {
+          start: {
+            line: 1,
+            column: 9
+          },
+          end: {
+            line: 1,
+            column: 13
+          }
+        }
       },
       params: [],
       body: {
         type: "BlockStatement",
-        start: {line: 1, column: 16},
         body: [
           {
             type: "FunctionDeclaration",
-            start: {line: 1, column: 18},
             id: {
               type: "Identifier",
-              start: {line: 1, column: 27},
               name: "inner",
-              end: {line: 1, column: 32}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 27
+                },
+                end: {
+                  line: 1,
+                  column: 32
+                }
+              }
             },
             params: [],
             body: {
               type: "BlockStatement",
-              start: {line: 1, column: 35},
               body: [
                 {
                   type: "ExpressionStatement",
-                  start: {line: 1, column: 37},
                   expression: {
                     type: "Literal",
-                    start: {line: 1, column: 37},
                     value: "use strict",
-                    end: {line: 1, column: 49}
+                    loc: {
+                      start: {
+                        line: 1,
+                        column: 37
+                      },
+                      end: {
+                        line: 1,
+                        column: 49
+                      }
+                    }
                   },
-                  end: {line: 1, column: 49}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 37
+                    },
+                    end: {
+                      line: 1,
+                      column: 49
+                    }
+                  }
                 }
               ],
-              end: {line: 1, column: 51}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 35
+                },
+                end: {
+                  line: 1,
+                  column: 51
+                }
+              }
             },
-            end: {line: 1, column: 51}
+            loc: {
+              start: {
+                line: 1,
+                column: 18
+              },
+              end: {
+                line: 1,
+                column: 51
+              }
+            }
           }
         ],
-        end: {line: 1, column: 53}
+        loc: {
+          start: {
+            line: 1,
+            column: 16
+          },
+          end: {
+            line: 1,
+            column: 53
+          }
+        }
       },
-      end: {line: 1, column: 53}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 53
+        }
+      }
     }
   ],
-  end: {line: 1, column: 53}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 53
+    }
+  }
 });
 
 test("function hello(a) { sayHi(); }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "FunctionDeclaration",
-      start: {line: 1, column: 0},
       id: {
         type: "Identifier",
-        start: {line: 1, column: 9},
         name: "hello",
-        end: {line: 1, column: 14}
+        loc: {
+          start: {
+            line: 1,
+            column: 9
+          },
+          end: {
+            line: 1,
+            column: 14
+          }
+        }
       },
       params: [
         {
           type: "Identifier",
-          start: {line: 1, column: 15},
           name: "a",
-          end: {line: 1, column: 16}
+          loc: {
+            start: {
+              line: 1,
+              column: 15
+            },
+            end: {
+              line: 1,
+              column: 16
+            }
+          }
         }
       ],
       body: {
         type: "BlockStatement",
-        start: {line: 1, column: 18},
         body: [
           {
             type: "ExpressionStatement",
-            start: {line: 1, column: 20},
             expression: {
               type: "CallExpression",
-              start: {line: 1, column: 20},
               callee: {
                 type: "Identifier",
-                start: {line: 1, column: 20},
                 name: "sayHi",
-                end: {line: 1, column: 25}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 20
+                  },
+                  end: {
+                    line: 1,
+                    column: 25
+                  }
+                }
               },
               arguments: [],
-              end: {line: 1, column: 27}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 20
+                },
+                end: {
+                  line: 1,
+                  column: 27
+                }
+              }
             },
-            end: {line: 1, column: 28}
+            loc: {
+              start: {
+                line: 1,
+                column: 20
+              },
+              end: {
+                line: 1,
+                column: 28
+              }
+            }
           }
         ],
-        end: {line: 1, column: 30}
+        loc: {
+          start: {
+            line: 1,
+            column: 18
+          },
+          end: {
+            line: 1,
+            column: 30
+          }
+        }
       },
-      end: {line: 1, column: 30}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 30
+        }
+      }
     }
   ],
-  end: {line: 1, column: 30}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 30
+    }
+  }
 });
 
 test("function hello(a, b) { sayHi(); }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "FunctionDeclaration",
-      start: {line: 1, column: 0},
       id: {
         type: "Identifier",
-        start: {line: 1, column: 9},
         name: "hello",
-        end: {line: 1, column: 14}
+        loc: {
+          start: {
+            line: 1,
+            column: 9
+          },
+          end: {
+            line: 1,
+            column: 14
+          }
+        }
       },
       params: [
         {
           type: "Identifier",
-          start: {line: 1, column: 15},
           name: "a",
-          end: {line: 1, column: 16}
+          loc: {
+            start: {
+              line: 1,
+              column: 15
+            },
+            end: {
+              line: 1,
+              column: 16
+            }
+          }
         },
         {
           type: "Identifier",
-          start: {line: 1, column: 18},
           name: "b",
-          end: {line: 1, column: 19}
+          loc: {
+            start: {
+              line: 1,
+              column: 18
+            },
+            end: {
+              line: 1,
+              column: 19
+            }
+          }
         }
       ],
       body: {
         type: "BlockStatement",
-        start: {line: 1, column: 21},
         body: [
           {
             type: "ExpressionStatement",
-            start: {line: 1, column: 23},
             expression: {
               type: "CallExpression",
-              start: {line: 1, column: 23},
               callee: {
                 type: "Identifier",
-                start: {line: 1, column: 23},
                 name: "sayHi",
-                end: {line: 1, column: 28}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 23
+                  },
+                  end: {
+                    line: 1,
+                    column: 28
+                  }
+                }
               },
               arguments: [],
-              end: {line: 1, column: 30}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 23
+                },
+                end: {
+                  line: 1,
+                  column: 30
+                }
+              }
             },
-            end: {line: 1, column: 31}
+            loc: {
+              start: {
+                line: 1,
+                column: 23
+              },
+              end: {
+                line: 1,
+                column: 31
+              }
+            }
           }
         ],
-        end: {line: 1, column: 33}
+        loc: {
+          start: {
+            line: 1,
+            column: 21
+          },
+          end: {
+            line: 1,
+            column: 33
+          }
+        }
       },
-      end: {line: 1, column: 33}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 33
+        }
+      }
     }
   ],
-  end: {line: 1, column: 33}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 33
+    }
+  }
 });
 
 test("var hi = function() { sayHi() };", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "VariableDeclaration",
-      start: {line: 1, column: 0},
       declarations: [
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 4},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "hi",
-            end: {line: 1, column: 6}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 6
+              }
+            }
           },
           init: {
             type: "FunctionExpression",
-            start: {line: 1, column: 9},
             id: null,
             params: [],
             body: {
               type: "BlockStatement",
-              start: {line: 1, column: 20},
               body: [
                 {
                   type: "ExpressionStatement",
-                  start: {line: 1, column: 22},
                   expression: {
                     type: "CallExpression",
-                    start: {line: 1, column: 22},
                     callee: {
                       type: "Identifier",
-                      start: {line: 1, column: 22},
                       name: "sayHi",
-                      end: {line: 1, column: 27}
+                      loc: {
+                        start: {
+                          line: 1,
+                          column: 22
+                        },
+                        end: {
+                          line: 1,
+                          column: 27
+                        }
+                      }
                     },
                     arguments: [],
-                    end: {line: 1, column: 29}
+                    loc: {
+                      start: {
+                        line: 1,
+                        column: 22
+                      },
+                      end: {
+                        line: 1,
+                        column: 29
+                      }
+                    }
                   },
-                  end: {line: 1, column: 29}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 22
+                    },
+                    end: {
+                      line: 1,
+                      column: 29
+                    }
+                  }
                 }
               ],
-              end: {line: 1, column: 31}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 20
+                },
+                end: {
+                  line: 1,
+                  column: 31
+                }
+              }
             },
-            end: {line: 1, column: 31}
+            loc: {
+              start: {
+                line: 1,
+                column: 9
+              },
+              end: {
+                line: 1,
+                column: 31
+              }
+            }
           },
-          end: {line: 1, column: 31}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 31
+            }
+          }
         }
       ],
       kind: "var",
-      end: {line: 1, column: 31}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 31
+        }
+      }
     }
   ],
-  end: {line: 1, column: 32}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 32
+    }
+  }
 });
 
 test("var hi = function eval() { };", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "VariableDeclaration",
-      start: {line: 1, column: 0},
       declarations: [
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 4},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "hi",
-            end: {line: 1, column: 6}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 6
+              }
+            }
           },
           init: {
             type: "FunctionExpression",
-            start: {line: 1, column: 9},
             id: {
               type: "Identifier",
-              start: {line: 1, column: 18},
               name: "eval",
-              end: {line: 1, column: 22}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 18
+                },
+                end: {
+                  line: 1,
+                  column: 22
+                }
+              }
             },
             params: [],
             body: {
               type: "BlockStatement",
-              start: {line: 1, column: 25},
               body: [],
-              end: {line: 1, column: 28}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 25
+                },
+                end: {
+                  line: 1,
+                  column: 28
+                }
+              }
             },
-            end: {line: 1, column: 28}
+            loc: {
+              start: {
+                line: 1,
+                column: 9
+              },
+              end: {
+                line: 1,
+                column: 28
+              }
+            }
           },
-          end: {line: 1, column: 28}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 28
+            }
+          }
         }
       ],
       kind: "var",
-      end: {line: 1, column: 28}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 28
+        }
+      }
     }
   ],
-  end: {line: 1, column: 29}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 29
+    }
+  }
 });
 
 test("var hi = function arguments() { };", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "VariableDeclaration",
-      start: {line: 1, column: 0},
       declarations: [
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 4},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "hi",
-            end: {line: 1, column: 6}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 6
+              }
+            }
           },
           init: {
             type: "FunctionExpression",
-            start: {line: 1, column: 9},
             id: {
               type: "Identifier",
-              start: {line: 1, column: 18},
               name: "arguments",
-              end: {line: 1, column: 27}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 18
+                },
+                end: {
+                  line: 1,
+                  column: 27
+                }
+              }
             },
             params: [],
             body: {
               type: "BlockStatement",
-              start: {line: 1, column: 30},
               body: [],
-              end: {line: 1, column: 33}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 30
+                },
+                end: {
+                  line: 1,
+                  column: 33
+                }
+              }
             },
-            end: {line: 1, column: 33}
+            loc: {
+              start: {
+                line: 1,
+                column: 9
+              },
+              end: {
+                line: 1,
+                column: 33
+              }
+            }
           },
-          end: {line: 1, column: 33}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 33
+            }
+          }
         }
       ],
       kind: "var",
-      end: {line: 1, column: 33}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 33
+        }
+      }
     }
   ],
-  end: {line: 1, column: 34}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 34
+    }
+  }
 });
 
 test("var hello = function hi() { sayHi() };", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "VariableDeclaration",
-      start: {line: 1, column: 0},
       declarations: [
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 4},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "hello",
-            end: {line: 1, column: 9}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 9
+              }
+            }
           },
           init: {
             type: "FunctionExpression",
-            start: {line: 1, column: 12},
             id: {
               type: "Identifier",
-              start: {line: 1, column: 21},
               name: "hi",
-              end: {line: 1, column: 23}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 21
+                },
+                end: {
+                  line: 1,
+                  column: 23
+                }
+              }
             },
             params: [],
             body: {
               type: "BlockStatement",
-              start: {line: 1, column: 26},
               body: [
                 {
                   type: "ExpressionStatement",
-                  start: {line: 1, column: 28},
                   expression: {
                     type: "CallExpression",
-                    start: {line: 1, column: 28},
                     callee: {
                       type: "Identifier",
-                      start: {line: 1, column: 28},
                       name: "sayHi",
-                      end: {line: 1, column: 33}
+                      loc: {
+                        start: {
+                          line: 1,
+                          column: 28
+                        },
+                        end: {
+                          line: 1,
+                          column: 33
+                        }
+                      }
                     },
                     arguments: [],
-                    end: {line: 1, column: 35}
+                    loc: {
+                      start: {
+                        line: 1,
+                        column: 28
+                      },
+                      end: {
+                        line: 1,
+                        column: 35
+                      }
+                    }
                   },
-                  end: {line: 1, column: 35}
+                  loc: {
+                    start: {
+                      line: 1,
+                      column: 28
+                    },
+                    end: {
+                      line: 1,
+                      column: 35
+                    }
+                  }
                 }
               ],
-              end: {line: 1, column: 37}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 26
+                },
+                end: {
+                  line: 1,
+                  column: 37
+                }
+              }
             },
-            end: {line: 1, column: 37}
+            loc: {
+              start: {
+                line: 1,
+                column: 12
+              },
+              end: {
+                line: 1,
+                column: 37
+              }
+            }
           },
-          end: {line: 1, column: 37}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 37
+            }
+          }
         }
       ],
       kind: "var",
-      end: {line: 1, column: 37}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 37
+        }
+      }
     }
   ],
-  end: {line: 1, column: 38}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 38
+    }
+  }
 });
 
 test("(function(){})", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "FunctionExpression",
-        start: {line: 1, column: 1},
         id: null,
         params: [],
         body: {
           type: "BlockStatement",
-          start: {line: 1, column: 11},
           body: [],
-          end: {line: 1, column: 13}
+          loc: {
+            start: {
+              line: 1,
+              column: 11
+            },
+            end: {
+              line: 1,
+              column: 13
+            }
+          }
         },
-        end: {line: 1, column: 13}
+        loc: {
+          start: {
+            line: 1,
+            column: 1
+          },
+          end: {
+            line: 1,
+            column: 13
+          }
+        }
       },
-      end: {line: 1, column: 14}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 14
+        }
+      }
     }
   ],
-  end: {line: 1, column: 14}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 14
+    }
+  }
 });
 
 test("{ x\n++y }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "BlockStatement",
-      start: {line: 1, column: 0},
       body: [
         {
           type: "ExpressionStatement",
-          start: {line: 1, column: 2},
           expression: {
             type: "Identifier",
-            start: {line: 1, column: 2},
             name: "x",
-            end: {line: 1, column: 3}
+            loc: {
+              start: {
+                line: 1,
+                column: 2
+              },
+              end: {
+                line: 1,
+                column: 3
+              }
+            }
           },
-          end: {line: 1, column: 3}
+          loc: {
+            start: {
+              line: 1,
+              column: 2
+            },
+            end: {
+              line: 1,
+              column: 3
+            }
+          }
         },
         {
           type: "ExpressionStatement",
-          start: {line: 2, column: 0},
           expression: {
             type: "UpdateExpression",
-            start: {line: 2, column: 0},
             operator: "++",
             prefix: true,
             argument: {
               type: "Identifier",
-              start: {line: 2, column: 2},
               name: "y",
-              end: {line: 2, column: 3}
+              loc: {
+                start: {
+                  line: 2,
+                  column: 2
+                },
+                end: {
+                  line: 2,
+                  column: 3
+                }
+              }
             },
-            end: {line: 2, column: 3}
+            loc: {
+              start: {
+                line: 2,
+                column: 0
+              },
+              end: {
+                line: 2,
+                column: 3
+              }
+            }
           },
-          end: {line: 2, column: 3}
+          loc: {
+            start: {
+              line: 2,
+              column: 0
+            },
+            end: {
+              line: 2,
+              column: 3
+            }
+          }
         }
       ],
-      end: {line: 2, column: 5}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 2,
+          column: 5
+        }
+      }
     }
   ],
-  end: {line: 2, column: 5}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 2,
+      column: 5
+    }
+  }
 });
 
 test("{ x\n--y }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "BlockStatement",
-      start: {line: 1, column: 0},
       body: [
         {
           type: "ExpressionStatement",
-          start: {line: 1, column: 2},
           expression: {
             type: "Identifier",
-            start: {line: 1, column: 2},
             name: "x",
-            end: {line: 1, column: 3}
+            loc: {
+              start: {
+                line: 1,
+                column: 2
+              },
+              end: {
+                line: 1,
+                column: 3
+              }
+            }
           },
-          end: {line: 1, column: 3}
+          loc: {
+            start: {
+              line: 1,
+              column: 2
+            },
+            end: {
+              line: 1,
+              column: 3
+            }
+          }
         },
         {
           type: "ExpressionStatement",
-          start: {line: 2, column: 0},
           expression: {
             type: "UpdateExpression",
-            start: {line: 2, column: 0},
             operator: "--",
             prefix: true,
             argument: {
               type: "Identifier",
-              start: {line: 2, column: 2},
               name: "y",
-              end: {line: 2, column: 3}
+              loc: {
+                start: {
+                  line: 2,
+                  column: 2
+                },
+                end: {
+                  line: 2,
+                  column: 3
+                }
+              }
             },
-            end: {line: 2, column: 3}
+            loc: {
+              start: {
+                line: 2,
+                column: 0
+              },
+              end: {
+                line: 2,
+                column: 3
+              }
+            }
           },
-          end: {line: 2, column: 3}
+          loc: {
+            start: {
+              line: 2,
+              column: 0
+            },
+            end: {
+              line: 2,
+              column: 3
+            }
+          }
         }
       ],
-      end: {line: 2, column: 5}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 2,
+          column: 5
+        }
+      }
     }
   ],
-  end: {line: 2, column: 5}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 2,
+      column: 5
+    }
+  }
 });
 
 test("var x /* comment */;", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "VariableDeclaration",
-      start: {line: 1, column: 0},
       declarations: [
         {
           type: "VariableDeclarator",
-          start: {line: 1, column: 4},
           id: {
             type: "Identifier",
-            start: {line: 1, column: 4},
             name: "x",
-            end: {line: 1, column: 5}
+            loc: {
+              start: {
+                line: 1,
+                column: 4
+              },
+              end: {
+                line: 1,
+                column: 5
+              }
+            }
           },
           init: null,
-          end: {line: 1, column: 5}
+          loc: {
+            start: {
+              line: 1,
+              column: 4
+            },
+            end: {
+              line: 1,
+              column: 5
+            }
+          }
         }
       ],
       kind: "var",
-      end: {line: 1, column: 5}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 1,
+          column: 5
+        }
+      }
     }
   ],
-  end: {line: 1, column: 20}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 20
+    }
+  }
 });
 
 test("{ var x = 14, y = 3\nz; }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "BlockStatement",
-      start: {line: 1, column: 0},
       body: [
         {
           type: "VariableDeclaration",
-          start: {line: 1, column: 2},
           declarations: [
             {
               type: "VariableDeclarator",
-              start: {line: 1, column: 6},
               id: {
                 type: "Identifier",
-                start: {line: 1, column: 6},
                 name: "x",
-                end: {line: 1, column: 7}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 6
+                  },
+                  end: {
+                    line: 1,
+                    column: 7
+                  }
+                }
               },
               init: {
                 type: "Literal",
-                start: {line: 1, column: 10},
                 value: 14,
-                end: {line: 1, column: 12}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 10
+                  },
+                  end: {
+                    line: 1,
+                    column: 12
+                  }
+                }
               },
-              end: {line: 1, column: 12}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 6
+                },
+                end: {
+                  line: 1,
+                  column: 12
+                }
+              }
             },
             {
               type: "VariableDeclarator",
-              start: {line: 1, column: 14},
               id: {
                 type: "Identifier",
-                start: {line: 1, column: 14},
                 name: "y",
-                end: {line: 1, column: 15}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 14
+                  },
+                  end: {
+                    line: 1,
+                    column: 15
+                  }
+                }
               },
               init: {
                 type: "Literal",
-                start: {line: 1, column: 18},
                 value: 3,
-                end: {line: 1, column: 19}
+                loc: {
+                  start: {
+                    line: 1,
+                    column: 18
+                  },
+                  end: {
+                    line: 1,
+                    column: 19
+                  }
+                }
               },
-              end: {line: 1, column: 19}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 14
+                },
+                end: {
+                  line: 1,
+                  column: 19
+                }
+              }
             }
           ],
           kind: "var",
-          end: {line: 1, column: 19}
+          loc: {
+            start: {
+              line: 1,
+              column: 2
+            },
+            end: {
+              line: 1,
+              column: 19
+            }
+          }
         },
         {
           type: "ExpressionStatement",
-          start: {line: 2, column: 0},
           expression: {
             type: "Identifier",
-            start: {line: 2, column: 0},
             name: "z",
-            end: {line: 2, column: 1}
+            loc: {
+              start: {
+                line: 2,
+                column: 0
+              },
+              end: {
+                line: 2,
+                column: 1
+              }
+            }
           },
-          end: {line: 2, column: 2}
+          loc: {
+            start: {
+              line: 2,
+              column: 0
+            },
+            end: {
+              line: 2,
+              column: 2
+            }
+          }
         }
       ],
-      end: {line: 2, column: 4}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 2,
+          column: 4
+        }
+      }
     }
   ],
-  end: {line: 2, column: 4}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 2,
+      column: 4
+    }
+  }
 });
 
 test("while (true) { continue\nthere; }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "WhileStatement",
-      start: {line: 1, column: 0},
       test: {
         type: "Literal",
-        start: {line: 1, column: 7},
         value: true,
-        end: {line: 1, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 7
+          },
+          end: {
+            line: 1,
+            column: 11
+          }
+        }
       },
       body: {
         type: "BlockStatement",
-        start: {line: 1, column: 13},
         body: [
           {
             type: "ContinueStatement",
-            start: {line: 1, column: 15},
             label: null,
-            end: {line: 1, column: 23}
+            loc: {
+              start: {
+                line: 1,
+                column: 15
+              },
+              end: {
+                line: 1,
+                column: 23
+              }
+            }
           },
           {
             type: "ExpressionStatement",
-            start: {line: 2, column: 0},
             expression: {
               type: "Identifier",
-              start: {line: 2, column: 0},
               name: "there",
-              end: {line: 2, column: 5}
+              loc: {
+                start: {
+                  line: 2,
+                  column: 0
+                },
+                end: {
+                  line: 2,
+                  column: 5
+                }
+              }
             },
-            end: {line: 2, column: 6}
+            loc: {
+              start: {
+                line: 2,
+                column: 0
+              },
+              end: {
+                line: 2,
+                column: 6
+              }
+            }
           }
         ],
-        end: {line: 2, column: 8}
+        loc: {
+          start: {
+            line: 1,
+            column: 13
+          },
+          end: {
+            line: 2,
+            column: 8
+          }
+        }
       },
-      end: {line: 2, column: 8}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 2,
+          column: 8
+        }
+      }
     }
   ],
-  end: {line: 2, column: 8}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 2,
+      column: 8
+    }
+  }
 });
 
 test("while (true) { continue // Comment\nthere; }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "WhileStatement",
-      start: {line: 1, column: 0},
       test: {
         type: "Literal",
-        start: {line: 1, column: 7},
         value: true,
-        end: {line: 1, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 7
+          },
+          end: {
+            line: 1,
+            column: 11
+          }
+        }
       },
       body: {
         type: "BlockStatement",
-        start: {line: 1, column: 13},
         body: [
           {
             type: "ContinueStatement",
-            start: {line: 1, column: 15},
             label: null,
-            end: {line: 1, column: 23}
+            loc: {
+              start: {
+                line: 1,
+                column: 15
+              },
+              end: {
+                line: 1,
+                column: 23
+              }
+            }
           },
           {
             type: "ExpressionStatement",
-            start: {line: 2, column: 0},
             expression: {
               type: "Identifier",
-              start: {line: 2, column: 0},
               name: "there",
-              end: {line: 2, column: 5}
+              loc: {
+                start: {
+                  line: 2,
+                  column: 0
+                },
+                end: {
+                  line: 2,
+                  column: 5
+                }
+              }
             },
-            end: {line: 2, column: 6}
+            loc: {
+              start: {
+                line: 2,
+                column: 0
+              },
+              end: {
+                line: 2,
+                column: 6
+              }
+            }
           }
         ],
-        end: {line: 2, column: 8}
+        loc: {
+          start: {
+            line: 1,
+            column: 13
+          },
+          end: {
+            line: 2,
+            column: 8
+          }
+        }
       },
-      end: {line: 2, column: 8}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 2,
+          column: 8
+        }
+      }
     }
   ],
-  end: {line: 2, column: 8}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 2,
+      column: 8
+    }
+  }
 });
 
 test("while (true) { continue /* Multiline\nComment */there; }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "WhileStatement",
-      start: {line: 1, column: 0},
       test: {
         type: "Literal",
-        start: {line: 1, column: 7},
         value: true,
-        end: {line: 1, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 7
+          },
+          end: {
+            line: 1,
+            column: 11
+          }
+        }
       },
       body: {
         type: "BlockStatement",
-        start: {line: 1, column: 13},
         body: [
           {
             type: "ContinueStatement",
-            start: {line: 1, column: 15},
             label: null,
-            end: {line: 1, column: 23}
+            loc: {
+              start: {
+                line: 1,
+                column: 15
+              },
+              end: {
+                line: 1,
+                column: 23
+              }
+            }
           },
           {
             type: "ExpressionStatement",
-            start: {line: 2, column: 10},
             expression: {
               type: "Identifier",
-              start: {line: 2, column: 10},
               name: "there",
-              end: {line: 2, column: 15}
+              loc: {
+                start: {
+                  line: 2,
+                  column: 10
+                },
+                end: {
+                  line: 2,
+                  column: 15
+                }
+              }
             },
-            end: {line: 2, column: 16}
+            loc: {
+              start: {
+                line: 2,
+                column: 10
+              },
+              end: {
+                line: 2,
+                column: 16
+              }
+            }
           }
         ],
-        end: {line: 2, column: 18}
+        loc: {
+          start: {
+            line: 1,
+            column: 13
+          },
+          end: {
+            line: 2,
+            column: 18
+          }
+        }
       },
-      end: {line: 2, column: 18}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 2,
+          column: 18
+        }
+      }
     }
   ],
-  end: {line: 2, column: 18}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 2,
+      column: 18
+    }
+  }
 });
 
 test("while (true) { break\nthere; }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "WhileStatement",
-      start: {line: 1, column: 0},
       test: {
         type: "Literal",
-        start: {line: 1, column: 7},
         value: true,
-        end: {line: 1, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 7
+          },
+          end: {
+            line: 1,
+            column: 11
+          }
+        }
       },
       body: {
         type: "BlockStatement",
-        start: {line: 1, column: 13},
         body: [
           {
             type: "BreakStatement",
-            start: {line: 1, column: 15},
             label: null,
-            end: {line: 1, column: 20}
+            loc: {
+              start: {
+                line: 1,
+                column: 15
+              },
+              end: {
+                line: 1,
+                column: 20
+              }
+            }
           },
           {
             type: "ExpressionStatement",
-            start: {line: 2, column: 0},
             expression: {
               type: "Identifier",
-              start: {line: 2, column: 0},
               name: "there",
-              end: {line: 2, column: 5}
+              loc: {
+                start: {
+                  line: 2,
+                  column: 0
+                },
+                end: {
+                  line: 2,
+                  column: 5
+                }
+              }
             },
-            end: {line: 2, column: 6}
+            loc: {
+              start: {
+                line: 2,
+                column: 0
+              },
+              end: {
+                line: 2,
+                column: 6
+              }
+            }
           }
         ],
-        end: {line: 2, column: 8}
+        loc: {
+          start: {
+            line: 1,
+            column: 13
+          },
+          end: {
+            line: 2,
+            column: 8
+          }
+        }
       },
-      end: {line: 2, column: 8}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 2,
+          column: 8
+        }
+      }
     }
   ],
-  end: {line: 2, column: 8}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 2,
+      column: 8
+    }
+  }
 });
 
 test("while (true) { break // Comment\nthere; }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "WhileStatement",
-      start: {line: 1, column: 0},
       test: {
         type: "Literal",
-        start: {line: 1, column: 7},
         value: true,
-        end: {line: 1, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 7
+          },
+          end: {
+            line: 1,
+            column: 11
+          }
+        }
       },
       body: {
         type: "BlockStatement",
-        start: {line: 1, column: 13},
         body: [
           {
             type: "BreakStatement",
-            start: {line: 1, column: 15},
             label: null,
-            end: {line: 1, column: 20}
+            loc: {
+              start: {
+                line: 1,
+                column: 15
+              },
+              end: {
+                line: 1,
+                column: 20
+              }
+            }
           },
           {
             type: "ExpressionStatement",
-            start: {line: 2, column: 0},
             expression: {
               type: "Identifier",
-              start: {line: 2, column: 0},
               name: "there",
-              end: {line: 2, column: 5}
+              loc: {
+                start: {
+                  line: 2,
+                  column: 0
+                },
+                end: {
+                  line: 2,
+                  column: 5
+                }
+              }
             },
-            end: {line: 2, column: 6}
+            loc: {
+              start: {
+                line: 2,
+                column: 0
+              },
+              end: {
+                line: 2,
+                column: 6
+              }
+            }
           }
         ],
-        end: {line: 2, column: 8}
+        loc: {
+          start: {
+            line: 1,
+            column: 13
+          },
+          end: {
+            line: 2,
+            column: 8
+          }
+        }
       },
-      end: {line: 2, column: 8}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 2,
+          column: 8
+        }
+      }
     }
   ],
-  end: {line: 2, column: 8}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 2,
+      column: 8
+    }
+  }
 });
 
 test("while (true) { break /* Multiline\nComment */there; }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "WhileStatement",
-      start: {line: 1, column: 0},
       test: {
         type: "Literal",
-        start: {line: 1, column: 7},
         value: true,
-        end: {line: 1, column: 11}
+        loc: {
+          start: {
+            line: 1,
+            column: 7
+          },
+          end: {
+            line: 1,
+            column: 11
+          }
+        }
       },
       body: {
         type: "BlockStatement",
-        start: {line: 1, column: 13},
         body: [
           {
             type: "BreakStatement",
-            start: {line: 1, column: 15},
             label: null,
-            end: {line: 1, column: 20}
+            loc: {
+              start: {
+                line: 1,
+                column: 15
+              },
+              end: {
+                line: 1,
+                column: 20
+              }
+            }
           },
           {
             type: "ExpressionStatement",
-            start: {line: 2, column: 10},
             expression: {
               type: "Identifier",
-              start: {line: 2, column: 10},
               name: "there",
-              end: {line: 2, column: 15}
+              loc: {
+                start: {
+                  line: 2,
+                  column: 10
+                },
+                end: {
+                  line: 2,
+                  column: 15
+                }
+              }
             },
-            end: {line: 2, column: 16}
+            loc: {
+              start: {
+                line: 2,
+                column: 10
+              },
+              end: {
+                line: 2,
+                column: 16
+              }
+            }
           }
         ],
-        end: {line: 2, column: 18}
+        loc: {
+          start: {
+            line: 1,
+            column: 13
+          },
+          end: {
+            line: 2,
+            column: 18
+          }
+        }
       },
-      end: {line: 2, column: 18}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 2,
+          column: 18
+        }
+      }
     }
   ],
-  end: {line: 2, column: 18}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 2,
+      column: 18
+    }
+  }
 });
 
 test("(function(){ return\nx; })", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "FunctionExpression",
-        start: {line: 1, column: 1},
         id: null,
         params: [],
         body: {
           type: "BlockStatement",
-          start: {line: 1, column: 11},
           body: [
             {
               type: "ReturnStatement",
-              start: {line: 1, column: 13},
               argument: null,
-              end: {line: 1, column: 19}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 13
+                },
+                end: {
+                  line: 1,
+                  column: 19
+                }
+              }
             },
             {
               type: "ExpressionStatement",
-              start: {line: 2, column: 0},
               expression: {
                 type: "Identifier",
-                start: {line: 2, column: 0},
                 name: "x",
-                end: {line: 2, column: 1}
+                loc: {
+                  start: {
+                    line: 2,
+                    column: 0
+                  },
+                  end: {
+                    line: 2,
+                    column: 1
+                  }
+                }
               },
-              end: {line: 2, column: 2}
+              loc: {
+                start: {
+                  line: 2,
+                  column: 0
+                },
+                end: {
+                  line: 2,
+                  column: 2
+                }
+              }
             }
           ],
-          end: {line: 2, column: 4}
+          loc: {
+            start: {
+              line: 1,
+              column: 11
+            },
+            end: {
+              line: 2,
+              column: 4
+            }
+          }
         },
-        end: {line: 2, column: 4}
+        loc: {
+          start: {
+            line: 1,
+            column: 1
+          },
+          end: {
+            line: 2,
+            column: 4
+          }
+        }
       },
-      end: {line: 2, column: 5}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 2,
+          column: 5
+        }
+      }
     }
   ],
-  end: {line: 2, column: 5}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 2,
+      column: 5
+    }
+  }
 });
 
 test("(function(){ return // Comment\nx; })", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "FunctionExpression",
-        start: {line: 1, column: 1},
         id: null,
         params: [],
         body: {
           type: "BlockStatement",
-          start: {line: 1, column: 11},
           body: [
             {
               type: "ReturnStatement",
-              start: {line: 1, column: 13},
               argument: null,
-              end: {line: 1, column: 19}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 13
+                },
+                end: {
+                  line: 1,
+                  column: 19
+                }
+              }
             },
             {
               type: "ExpressionStatement",
-              start: {line: 2, column: 0},
               expression: {
                 type: "Identifier",
-                start: {line: 2, column: 0},
                 name: "x",
-                end: {line: 2, column: 1}
+                loc: {
+                  start: {
+                    line: 2,
+                    column: 0
+                  },
+                  end: {
+                    line: 2,
+                    column: 1
+                  }
+                }
               },
-              end: {line: 2, column: 2}
+              loc: {
+                start: {
+                  line: 2,
+                  column: 0
+                },
+                end: {
+                  line: 2,
+                  column: 2
+                }
+              }
             }
           ],
-          end: {line: 2, column: 4}
+          loc: {
+            start: {
+              line: 1,
+              column: 11
+            },
+            end: {
+              line: 2,
+              column: 4
+            }
+          }
         },
-        end: {line: 2, column: 4}
+        loc: {
+          start: {
+            line: 1,
+            column: 1
+          },
+          end: {
+            line: 2,
+            column: 4
+          }
+        }
       },
-      end: {line: 2, column: 5}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 2,
+          column: 5
+        }
+      }
     }
   ],
-  end: {line: 2, column: 5}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 2,
+      column: 5
+    }
+  }
 });
 
 test("(function(){ return/* Multiline\nComment */x; })", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "ExpressionStatement",
-      start: {line: 1, column: 0},
       expression: {
         type: "FunctionExpression",
-        start: {line: 1, column: 1},
         id: null,
         params: [],
         body: {
           type: "BlockStatement",
-          start: {line: 1, column: 11},
           body: [
             {
               type: "ReturnStatement",
-              start: {line: 1, column: 13},
               argument: null,
-              end: {line: 1, column: 19}
+              loc: {
+                start: {
+                  line: 1,
+                  column: 13
+                },
+                end: {
+                  line: 1,
+                  column: 19
+                }
+              }
             },
             {
               type: "ExpressionStatement",
-              start: {line: 2, column: 10},
               expression: {
                 type: "Identifier",
-                start: {line: 2, column: 10},
                 name: "x",
-                end: {line: 2, column: 11}
+                loc: {
+                  start: {
+                    line: 2,
+                    column: 10
+                  },
+                  end: {
+                    line: 2,
+                    column: 11
+                  }
+                }
               },
-              end: {line: 2, column: 12}
+              loc: {
+                start: {
+                  line: 2,
+                  column: 10
+                },
+                end: {
+                  line: 2,
+                  column: 12
+                }
+              }
             }
           ],
-          end: {line: 2, column: 14}
+          loc: {
+            start: {
+              line: 1,
+              column: 11
+            },
+            end: {
+              line: 2,
+              column: 14
+            }
+          }
         },
-        end: {line: 2, column: 14}
+        loc: {
+          start: {
+            line: 1,
+            column: 1
+          },
+          end: {
+            line: 2,
+            column: 14
+          }
+        }
       },
-      end: {line: 2, column: 15}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 2,
+          column: 15
+        }
+      }
     }
   ],
-  end: {line: 2, column: 15}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 2,
+      column: 15
+    }
+  }
 });
 
 test("{ throw error\nerror; }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "BlockStatement",
-      start: {line: 1, column: 0},
       body: [
         {
           type: "ThrowStatement",
-          start: {line: 1, column: 2},
           argument: {
             type: "Identifier",
-            start: {line: 1, column: 8},
             name: "error",
-            end: {line: 1, column: 13}
+            loc: {
+              start: {
+                line: 1,
+                column: 8
+              },
+              end: {
+                line: 1,
+                column: 13
+              }
+            }
           },
-          end: {line: 1, column: 13}
+          loc: {
+            start: {
+              line: 1,
+              column: 2
+            },
+            end: {
+              line: 1,
+              column: 13
+            }
+          }
         },
         {
           type: "ExpressionStatement",
-          start: {line: 2, column: 0},
           expression: {
             type: "Identifier",
-            start: {line: 2, column: 0},
             name: "error",
-            end: {line: 2, column: 5}
+            loc: {
+              start: {
+                line: 2,
+                column: 0
+              },
+              end: {
+                line: 2,
+                column: 5
+              }
+            }
           },
-          end: {line: 2, column: 6}
+          loc: {
+            start: {
+              line: 2,
+              column: 0
+            },
+            end: {
+              line: 2,
+              column: 6
+            }
+          }
         }
       ],
-      end: {line: 2, column: 8}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 2,
+          column: 8
+        }
+      }
     }
   ],
-  end: {line: 2, column: 8}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 2,
+      column: 8
+    }
+  }
 });
 
 test("{ throw error// Comment\nerror; }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "BlockStatement",
-      start: {line: 1, column: 0},
       body: [
         {
           type: "ThrowStatement",
-          start: {line: 1, column: 2},
           argument: {
             type: "Identifier",
-            start: {line: 1, column: 8},
             name: "error",
-            end: {line: 1, column: 13}
+            loc: {
+              start: {
+                line: 1,
+                column: 8
+              },
+              end: {
+                line: 1,
+                column: 13
+              }
+            }
           },
-          end: {line: 1, column: 13}
+          loc: {
+            start: {
+              line: 1,
+              column: 2
+            },
+            end: {
+              line: 1,
+              column: 13
+            }
+          }
         },
         {
           type: "ExpressionStatement",
-          start: {line: 2, column: 0},
           expression: {
             type: "Identifier",
-            start: {line: 2, column: 0},
             name: "error",
-            end: {line: 2, column: 5}
+            loc: {
+              start: {
+                line: 2,
+                column: 0
+              },
+              end: {
+                line: 2,
+                column: 5
+              }
+            }
           },
-          end: {line: 2, column: 6}
+          loc: {
+            start: {
+              line: 2,
+              column: 0
+            },
+            end: {
+              line: 2,
+              column: 6
+            }
+          }
         }
       ],
-      end: {line: 2, column: 8}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 2,
+          column: 8
+        }
+      }
     }
   ],
-  end: {line: 2, column: 8}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 2,
+      column: 8
+    }
+  }
 });
 
 test("{ throw error/* Multiline\nComment */error; }", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [
     {
       type: "BlockStatement",
-      start: {line: 1, column: 0},
       body: [
         {
           type: "ThrowStatement",
-          start: {line: 1, column: 2},
           argument: {
             type: "Identifier",
-            start: {line: 1, column: 8},
             name: "error",
-            end: {line: 1, column: 13}
+            loc: {
+              start: {
+                line: 1,
+                column: 8
+              },
+              end: {
+                line: 1,
+                column: 13
+              }
+            }
           },
-          end: {line: 1, column: 13}
+          loc: {
+            start: {
+              line: 1,
+              column: 2
+            },
+            end: {
+              line: 1,
+              column: 13
+            }
+          }
         },
         {
           type: "ExpressionStatement",
-          start: {line: 2, column: 10},
           expression: {
             type: "Identifier",
-            start: {line: 2, column: 10},
             name: "error",
-            end: {line: 2, column: 15}
+            loc: {
+              start: {
+                line: 2,
+                column: 10
+              },
+              end: {
+                line: 2,
+                column: 15
+              }
+            }
           },
-          end: {line: 2, column: 16}
+          loc: {
+            start: {
+              line: 2,
+              column: 10
+            },
+            end: {
+              line: 2,
+              column: 16
+            }
+          }
         }
       ],
-      end: {line: 2, column: 18}
+      loc: {
+        start: {
+          line: 1,
+          column: 0
+        },
+        end: {
+          line: 2,
+          column: 18
+        }
+      }
     }
   ],
-  end: {line: 2, column: 18}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 2,
+      column: 18
+    }
+  }
 });
 
 test("", {
   type: "Program",
-  start: {line: 1, column: 0},
   body: [],
-  end: {line: 1, column: 0}
+  loc: {
+    start: {
+      line: 1,
+      column: 0
+    },
+    end: {
+      line: 1,
+      column: 0
+    }
+  }
 });
 
 // Failure tests
@@ -11392,7 +25754,7 @@ testFail("3x0",
          "Identifier directly after number (1:1)");
 
 testFail("0x",
-         "Expected hexadecimal number (undefined:undefined)");
+         "Expected hexadecimal number (1:2)");
 
 testFail("09",
          "Invalid number (1:0)");