diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_8_1/regress/regress-496922.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_8_1/regress/regress-496922.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,40 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 496922;
+var summary = 'Incorrect handling of extra arguments';
+var actual = ''
+var expect = '0,0,1,1,2,2,3,3';
+
+
+//-----------------------------------------------------------------------------
+
+// The code must run as part of the top-level script in order to get the bug.
+enterFunc ('test');
+printBugNumber(BUGNUMBER);
+printStatus (summary);
+jit(true);
+
+var a = [];
+let(
+f = function() {
+    for (let x = 0; x < 4; ++x) {
+        (function() {
+            for (let y = 0; y < 2; ++y) {
+              a.push(x);
+            }
+        })()
+    }
+}) { (function() {})()
+    f(99)
+}
+actual = '' + a;
+
+jit(false);
+reportCompare(expect, actual, summary);
+exitFunc ('test');
+//-----------------------------------------------------------------------------
+