add higher priority to exponent operator, better async contextual functions

acorn.js

@@ -469,7 +469,7 @@
 
   // '*' may be multiply or have special meaning in ES6
   var _star = {binop: 10, beforeExpr: true};
-  var _exponent = {binop: 10, beforeExpr: true};
+  var _exponent = {binop: 11, beforeExpr: true};
 
   // '<', '>' may be relational or have special meaning in JSX
   var _lt = {binop: 7, beforeExpr: true}, _gt = {binop: 7, beforeExpr: true};
@@ -2618,12 +2618,8 @@
 
           // normal functions
           if (tokType === _function) {
-            if (isStatement) {
-              // no line terminator after `async` contextual keyword
-              if (tokType === _semi || canInsertSemicolon()) {
-                return id;
-              }
-            }
+            // no line terminator after `async` contextual keyword
+            if (canInsertSemicolon()) return id;
 
             next();
             return parseFunction(node, isStatement, true);

package.json

@@ -2,7 +2,7 @@
   "name": "acorn-6to5",
   "description": "Acorn fork used by 6to5",
   "main": "acorn.js",
-  "version": "0.11.1-10",
+  "version": "0.11.1-11",
   "maintainers": [
     {
       "name": "Marijn Haverbeke",