diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/basic/bug639529.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/basic/bug639529.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,4 @@
+function f() {}
+g = wrap(f);
+g.__defineGetter__('toString', f.toString);
+g.toString;