diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_5/Regress/regress-254974.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_5/Regress/regress-254974.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,38 @@
+/* -*- 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/. */
+
+//-----------------------------------------------------------------------------
+// this test originally was only seen if typed into the js shell.
+// loading as a script file did not exhibit the problem.
+// this test case may not exercise the problem properly.
+
+var BUGNUMBER = 254974;
+var summary = 'all var and arg properties should be JSPROP_SHARED';
+var actual = '';
+var expect = '';
+
+printBugNumber(BUGNUMBER);
+printStatus (summary);
+
+function testfunc(tokens) {
+  function eek(y) {} /* remove function eek and the code will change its behavior */
+  return tokens.split(/\]?(?:\[|$)/).shift();
+}
+bad=testfunc;
+function testfunc(tokens) {
+  return tokens.split(/\]?(?:\[|$)/).shift();
+}
+good=testfunc;
+
+var goodvalue = good("DIV[@id=\"test\"]");
+var badvalue = bad("DIV[@id=\"test\"]");
+
+printStatus(goodvalue);
+printStatus(badvalue);
+
+expect = goodvalue;
+actual = badvalue;
+ 
+reportCompare(expect, actual, summary);