diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug684922.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug684922.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,6 @@
+// |jit-test| error: InternalError
+var op = Object.prototype;
+op.b = op;
+op.__iterator__ = Iterator;
+for (var c in {}) {}
+