diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/for-of/semantics-02.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/for-of/semantics-02.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+// Replacing Array.prototype.iterator with something non-callable makes for-of throw.
+
+load(libdir + "asserts.js");
+load(libdir + "iteration.js");
+
+function test(v) {
+    Array.prototype[std_iterator] = v;
+    assertThrowsInstanceOf(function () { for (var x of []) ; }, TypeError);
+}
+test(undefined);
+test(null);
+test({});