diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_6/Comprehensions/scope.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_6/Comprehensions/scope.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,18 @@
+// The identifier of a ComprehensionFor is only bound within its tail.
+
+function t() {
+  var x = [0, 1, 2];
+  return [for (x of x) x*2]
+}
+assertDeepEq(t(), [0, 2, 4]);
+
+// Each iteration should create a fresh binding.  Unfortunately this is
+// not currently the case, but bug 449811 will fix this.
+function t2() {
+  var x = [0, 1, 2];
+  return [for (x of x) ()=>x]
+}
+// FIXME: Should be [0, 1, 2].
+assertDeepEq([for (x of t2()) x()], [2, 2, 2]);
+
+reportCompare(null, null, "test");