diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_5/Regress/regress-321874.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_5/Regress/regress-321874.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,207 @@
+/* -*- 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 = 321874;
+var summary = 'lhs must be a reference in (for lhs in rhs) ...';
+var actual = '';
+var expect = '';
+var section;
+
+printBugNumber(BUGNUMBER);
+printStatus (summary);
+
+function a() {}
+var b = {foo: 'bar'};
+
+printStatus('for-in tests');
+
+var v;
+section = summary + ': for((v) in b);';
+expect = 'foo';
+printStatus(section);
+try
+{
+  eval('for ((v) in b);');
+  actual = v;
+}
+catch(ex)
+{
+  printStatus(ex+'');
+  actual = 'error';
+} 
+reportCompare(expect, actual, section);
+
+section = summary + ': function foo(){for((v) in b);};foo();';
+expect = 'foo';
+printStatus(section);
+try
+{
+  eval('function foo(){ for ((v) in b);}; foo();');
+  actual = v;
+}
+catch(ex)
+{
+  printStatus(ex+'');
+  actual = 'error';
+} 
+reportCompare(expect, actual, section);
+
+section = summary + ': for(a() in b);';
+expect = 'error';
+printStatus(section);
+try
+{
+  eval('for (a() in b);');
+  actual = 'no error';
+}
+catch(ex)
+{
+  printStatus(ex+'');
+  actual = 'error';
+} 
+reportCompare(expect, actual, section);
+
+section = summary + ': function foo(){for(a() in b);};foo();';
+expect = 'error';
+printStatus(section);
+try
+{
+  eval('function foo(){ for (a() in b);};foo();');
+  actual = 'no error';
+}
+catch(ex)
+{
+  printStatus(ex+'');
+  actual = 'error';
+} 
+reportCompare(expect, actual, section);
+
+section = ': for(new a() in b);';
+expect = 'error';
+printStatus(section);
+try
+{
+  eval('for (new a() in b);');
+  actual = 'no error';
+}
+catch(ex)
+{
+  printStatus(ex+'');
+  actual = 'error';
+} 
+reportCompare(expect, actual, summary + section);
+
+section = ': function foo(){for(new a() in b);};foo();';
+expect = 'error';
+printStatus(section);
+try
+{
+  eval('function foo(){ for (new a() in b);};foo();');
+  actual = 'no error';
+}
+catch(ex)
+{
+  printStatus(ex+'');
+  actual = 'error';
+} 
+reportCompare(expect, actual, summary + section);
+
+section = ': for(void in b);';
+expect = 'error';
+printStatus(section);
+try
+{
+  eval('for (void in b);');
+  actual = 'no error';
+}
+catch(ex)
+{
+  printStatus(ex+'');
+  actual = 'error';
+} 
+reportCompare(expect, actual, summary + section);
+
+section = ': function foo(){for(void in b);};foo();';
+expect = 'error';
+printStatus(section);
+try
+{
+  eval('function foo(){ for (void in b);};foo();');
+  actual = 'no error';
+}
+catch(ex)
+{
+  printStatus(ex+'');
+  actual = 'error';
+} 
+reportCompare(expect, actual, summary + section);
+
+var d = 1;
+var e = 2;
+expect = 'error';
+section = ': for((d*e) in b);';
+printStatus(section);
+try
+{
+  eval('for ((d*e) in b);');
+  actual = 'no error';
+}
+catch(ex)
+{
+  printStatus(ex+'');
+  actual = 'error';
+} 
+reportCompare(expect, actual, summary + section);
+
+var d = 1;
+var e = 2;
+expect = 'error';
+section = ': function foo(){for((d*e) in b);};foo();';
+printStatus(section);
+try
+{
+  eval('function foo(){ for ((d*e) in b);};foo();');
+  actual = 'no error';
+}
+catch(ex)
+{
+  printStatus(ex+'');
+  actual = 'error';
+} 
+reportCompare(expect, actual, summary + section);
+
+const c = 0;
+expect = 0;
+section = ': for(c in b);';
+printStatus(section);
+try
+{
+  eval('for (c in b);');
+  actual = c;
+  printStatus('typeof c: ' + (typeof c) + ', c: ' + c);
+}
+catch(ex)
+{
+  printStatus(ex+'');
+  actual = 'error';
+} 
+reportCompare(expect, actual, summary + section);
+
+expect = 0;
+section = ': function foo(){for(c in b);};foo();';
+printStatus(section);
+try
+{
+  eval('function foo(){ for (c in b);};foo();');
+  actual = c;
+  printStatus('typeof c: ' + (typeof c) + ', c: ' + c);
+}
+catch(ex)
+{
+  printStatus(ex+'');
+  actual = 'error';
+} 
+reportCompare(expect, actual, summary + section);