diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/for-of/semantics-05.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/for-of/semantics-05.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,8 @@
+// Deleting String.prototype.iterator makes for-of stop working on strings.
+
+load(libdir + "asserts.js");
+load(libdir + "iteration.js");
+
+delete String.prototype[std_iterator];
+assertThrowsInstanceOf(function () { for (var v of "abc") ; }, TypeError);
+assertThrowsInstanceOf(function () { for (var v of new String("abc")) ; }, TypeError);