diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug643285.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug643285.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,4 @@
+function fun() {
+    (new Function ("function ff () { actual = '' + ff. caller; } function f () { ff (); } f ();")) ('function pf' + fun + '() {}');
+}
+fun();