diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_6/Comprehensions/generator-semantics.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_6/Comprehensions/generator-semantics.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,52 @@
+// Interaction of eval with generator expressions.
+function a1() {
+  var a = 10;
+  var g = (for (y of [0]) eval('var a=42;'));
+  g.next();
+  return a;
+}
+assertEq(a1(), 10);
+
+function a2() {
+  var a = 10;
+  (for (y of [0]) eval('a=42')).next();
+  return a;
+}
+assertEq(a2(), 42)
+
+// Arguments and this.
+function b1() {
+  return [for (arg of (for (i of [0, 1, 2]) arguments[i])) arg];
+}
+assertDeepEq(b1('a', 'b', 'c'), ['a', 'b', 'c']);
+
+function b2() {
+  return [for (x of (for (i of [0]) this)) x];
+}
+var b2o = { b2: b2 }
+assertDeepEq(b2o.b2(), [b2o])
+
+// Assignment to eval or arguments.
+function c1() {
+  return [for (arg of (for (i of [0, 1, 2]) arguments = i)) arg];
+}
+assertDeepEq(c1(), [0, 1, 2]);
+
+function c2() {
+  "use strict";
+  return eval('[for (arg of (for (i of [0, 1, 2]) arguments = i)) arg]');
+}
+assertThrows(c2, SyntaxError);
+
+function c3() {
+  return [for (arg of (for (i of [0, 1, 2]) eval = i)) arg];
+}
+assertDeepEq(c3(), [0, 1, 2]);
+
+function c4() {
+  "use strict";
+  return eval('[for (arg of (for (i of [0, 1, 2]) eval = i)) arg]');
+}
+assertThrows(c4, SyntaxError);
+
+reportCompare(null, null, "test");