diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug790629-1.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug790629-1.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,10 @@
+// 'this' in generator-expression in strict-mode toplevel
+// is the same as global 'this'.
+
+"use strict";
+
+var it1 = (this for (x of [0]));
+assertEq(it1.next(), this);
+
+var it2 = (this for (x of (this for (y of (this for (z of [0]))))));
+assertEq(it2.next(), this);