diff -r 000000000000 -r 6474c204b198 js/src/jit-test/tests/auto-regress/bug639413.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/jit-test/tests/auto-regress/bug639413.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,9 @@
+// |jit-test| error:TypeError
+
+// Binary: cache/js-dbg-32-1c8e91b2e3a4-linux
+// Flags:
+//
+a = evalcx("lazy");
+a.watch("x", function() {});
+({}).watch("x", function() {});
+a.__defineGetter__("y", {});