diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_7/extensions/regress-591450.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_7/extensions/regress-591450.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,12 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/*
+ * Any copyright is dedicated to the Public Domain.
+ * http://creativecommons.org/licenses/publicdomain/
+ */
+
+/*
+ * This was causing the parser to assert at one point. Now it's not. Yay!
+ */
+function f(a,[x,y],b,[w,z],c) { function b() { } }
+
+reportCompare(0, 0, "don't crash");