diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug684281.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug684281.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,14 @@
+// Binary: cache/js-dbg-64-fcca99426576-linux
+// Flags: -m -n -a
+//
+
+function printStatus (msg) {}
+F = function () {};
+F.prototype = new Int32Array(1);
+o = new F();
+function f2(o){
+	with(this)
+	for(var x in o)
+	printStatus(o[x]);
+}
+f2([]);