diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug642422.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug642422.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,4 @@
+gczeal(2);
+var x;
+var foo = "for (var z = 0; z < 2; ++z) { new Object(new String(this), x)}";
+eval(foo);