diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug770952.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug770952.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,7 @@
+// |jit-test| error: TypeError
+load(libdir + "iteration.js");
+
+eval("var x; typeof x")
+Array.prototype[std_iterator] = function () { for(y in x); };
+for (var v of ['a', 'b', 'c', 'd'])
+    s = v;