diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_3/Regress/regress-419152.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_3/Regress/regress-419152.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,57 @@
+/* -*- 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 = 419152;
+var summary = 'Shaver can not contain himself';
+var actual = '';
+var expect = '';
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+function test()
+{
+  enterFunc ('test');
+  printBugNumber(BUGNUMBER);
+  printStatus (summary);
+ 
+  var a = [1,2,3];
+
+  a[5] = 6;
+  expect = '1,2,3,,,6:6';
+  actual = a + ':' + a.length;
+  reportCompare(expect, actual, summary + ': 1');
+
+  a = [1,2,3,4];
+  expect = 'undefined';
+  actual = a[-1] + '';
+  reportCompare(expect, actual, summary + ': 2');
+
+  a = [1,2,3];
+  a[-1] = 55;
+
+  expect = 3;
+  actual = a.length;
+  reportCompare(expect, actual, summary + ': 3');
+
+  expect = '1,2,3';
+  actual = a + '';
+  reportCompare(expect, actual, summary + ': 4');
+
+  expect = 55;
+  actual = a[-1];
+  reportCompare(expect, actual, summary + ': 5');
+
+  var s = "abcdef";
+
+  expect = 'undefined';
+  actual = s[-2] + '';
+  reportCompare(expect, actual, summary + ': 6');
+
+  exitFunc ('test');
+}