diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_5/Regress/regress-321757.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_5/Regress/regress-321757.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,109 @@
+/* -*- 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 = 321757;
+var summary = 'Compound assignment operators should not bind LHS';
+var actual = '';
+var expect = 'pass';
+
+printBugNumber(BUGNUMBER);
+printStatus (summary);
+
+try
+{
+  foo += 1;
+  actual = "fail";
+}
+catch (e)
+{
+  actual = "pass";
+}
+ 
+reportCompare(expect, actual, summary + ': +=');
+
+try
+{
+  foo -= 1;
+  actual = "fail";
+}
+catch (e)
+{
+  actual = "pass";
+}
+ 
+reportCompare(expect, actual, summary + ': -=');
+
+try
+{
+  foo *= 1;
+  actual = "fail";
+}
+catch (e)
+{
+  actual = "pass";
+}
+ 
+reportCompare(expect, actual, summary + ': *=');
+
+try
+{
+  foo /= 1;
+  actual = "fail";
+}
+catch (e)
+{
+  actual = "pass";
+}
+ 
+reportCompare(expect, actual, summary + ': /=');
+
+try
+{
+  foo %= 1;
+  actual = "fail";
+}
+catch (e)
+{
+  actual = "pass";
+}
+ 
+reportCompare(expect, actual, summary + ': %=');
+
+try
+{
+  foo <<= 1;
+  actual = "fail";
+}
+catch (e)
+{
+  actual = "pass";
+}
+ 
+reportCompare(expect, actual, summary + ': <<=');
+
+try
+{
+  foo >>= 1;
+  actual = "fail";
+}
+catch (e)
+{
+  actual = "pass";
+}
+ 
+reportCompare(expect, actual, summary + ': >>=');
+
+try
+{
+  foo >>>= 1;
+  actual = "fail";
+}
+catch (e)
+{
+  actual = "pass";
+}
+ 
+reportCompare(expect, actual, summary + ': >>>=');