diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug790629-3.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug790629-3.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,11 @@
+// 'this' in escaping generator-expression in a method
+// is the same as 'this' in the enclosing method
+// even if the method does not otherwise use 'this'.
+
+var obj = {
+    f: function () {
+        return (this for (x of [0]));
+    }
+};
+
+assertEq(obj.f().next(), obj);