diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_3/RegExp/15.10.4.1-6.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_3/RegExp/15.10.4.1-6.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,62 @@
+/* -*- 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/. */
+
+/*
+  15.10.4.1 new RegExp(pattern, flags)
+
+  If F contains any character other than "g", "i", or" m", or if it
+  contains the same one more than once, then throw a SyntaxError
+  exception.
+*/
+
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 476940;
+var summary = 'Section 15.10.4.1 - RegExp with invalid flags';
+var actual = '';
+var expect = '';
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+function test()
+{
+  enterFunc ('test');
+  printBugNumber(BUGNUMBER);
+  printStatus (summary);
+
+  var invalidflags = ['ii', 'gg', 'mm', 'a'];
+
+  for (var i = 0; i < invalidflags.length; i++)
+  {
+    var flag = invalidflags[i];
+    expect = 'SyntaxError: invalid regular expression flag ' + flag.charAt(0);
+    actual = '';
+    try
+    {
+      new RegExp('bar', flag);
+    }
+    catch(ex)
+    {
+      actual = ex + '';
+    }
+    reportCompare(expect, actual, summary + 
+                  ': new RegExp("bar", "' + flag + '")');
+
+    actual = '';
+    try
+    {
+      eval("/bar/" + flag);
+    }
+    catch(ex)
+    {
+      actual = ex + '';
+    }
+    reportCompare(expect, actual, summary + ': /bar/' + flag + ')');
+  }
+
+  exitFunc ('test');
+}