add support for tail calls when in completion record position - fixes #1572

test/core/fixtures/transformation/es6.tail-call/shadow/expected.js

@@ -2,12 +2,19 @@
 
 (function () {
   var _this = this,
-      _arguments = arguments;
+      _arguments2 = arguments;
 
   var foo = function foo() {
-    _this;
-    _arguments;
-    foo();
+    var _again = true;
+
+    _function: while (_again) {
+      _again = false;
+
+      _this;
+      _arguments2;
+      _again = true;
+      continue _function;
+    }
   };
   foo();
 });

test/core/fixtures/transformation/es6.tail-call/void/actual.js

@@ -0,0 +1,11 @@
+function skipWhile(cond) {
+  if (!hasNext() || cond(current, last)) return;
+  move();
+  skipWhile(cond);
+}
+
+var skipWhile2 = function (cond) {
+  if (!hasNext() || cond(current, last)) return;
+  move();
+  skipWhile2(cond);
+};

test/core/fixtures/transformation/es6.tail-call/void/expected.js

@@ -0,0 +1,31 @@
+"use strict";
+
+function skipWhile(_x) {
+  var _again = true;
+
+  _function: while (_again) {
+    var cond = _x;
+    _again = false;
+
+    if (!hasNext() || cond(current, last)) return;
+    move();
+    _x = cond;
+    _again = true;
+    continue _function;
+  }
+}
+
+var skipWhile2 = function skipWhile2(_x2) {
+  var _again2 = true;
+
+  _function2: while (_again2) {
+    var cond = _x2;
+    _again2 = false;
+
+    if (!hasNext() || cond(current, last)) return;
+    move();
+    _x2 = cond;
+    _again2 = true;
+    continue _function2;
+  }
+};