diff -r 000000000000 -r 6474c204b198 js/src/tests/ecma_3/ExecutionContexts/10.1.3-1.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/ecma_3/ExecutionContexts/10.1.3-1.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,167 @@
+/* -*- 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/. */
+
+/*
+ *
+ * Date:    11 Feb 2002
+ * SUMMARY: Testing functions having duplicate formal parameter names
+ *
+ * Note: given function f(x,x,x,x) {return x;}; f(1,2,3,4) should return 4.
+ * See ECMA-262 3rd Edition Final Section 10.1.3: Variable Instantiation
+ *
+ * Also see http://bugzilla.mozilla.org/show_bug.cgi?id=124900
+ */
+//-----------------------------------------------------------------------------
+var UBound = 0;
+var BUGNUMBER = 124900;
+var summary = 'Testing functions having duplicate formal parameter names';
+var status = '';
+var statusitems = [];
+var actual = '';
+var actualvalues = [];
+var expect= '';
+var expectedvalues = [];
+
+
+function f1(x,x)
+{
+  return x;
+}
+status = inSection(1);
+actual = f1(1,2);
+expect = 2;
+addThis();
+
+
+function f2(x,x,x)
+{
+  return x*x*x;
+}
+status = inSection(2);
+actual = f2(1,2,3);
+expect = 27;
+addThis();
+
+
+function f3(x,x,x,x)
+{
+  return 'a' + x + 'b' + x + 'c' + x ;
+}
+status = inSection(3);
+actual = f3(1,2,3,4);
+expect = 'a4b4c4';
+addThis();
+
+
+/*
+ * If the value of the last duplicate parameter is not provided by
+ * the function caller, the value of this parameter is undefined
+ */
+function f4(x,a,b,x,z)
+{
+  return x;
+}
+status = inSection(4);
+actual = f4(1,2);
+expect = undefined;
+addThis();
+
+
+/*
+ * f.toString() should preserve any duplicate formal parameter names that exist
+ */
+function f5(x,x,x,x)
+{
+}
+status = inSection(5);
+actual = f5.toString().match(/\((.*)\)/)[1];
+actual = actual.replace(/\s/g, ''); // for definiteness, remove any white space
+expect = 'x,x,x,x';
+addThis();
+
+
+function f6(x,x,x,x)
+{
+  var ret = [];
+
+  for (var i=0; i<arguments.length; i++)
+    ret.push(arguments[i]);
+
+  return ret.toString();
+}
+status = inSection(6);
+actual = f6(1,2,3,4);
+expect = '1,2,3,4';
+addThis();
+
+
+/*
+ * This variation (assigning to x inside f) is from nboyd@atg.com
+ * See http://bugzilla.mozilla.org/show_bug.cgi?id=124900
+ */
+function f7(x,x,x,x)
+{
+  x = 999;
+  var ret = [];
+
+  for (var i=0; i<arguments.length; i++)
+    ret.push(arguments[i]);
+
+  return ret.toString();
+}
+status = inSection(7);
+actual = f7(1,2,3,4);
+expect = '1,2,3,999';
+addThis();
+
+
+/*
+ * Same as above, but with |var| keyword added -
+ */
+function f8(x,x,x,x)
+{
+  var x = 999;
+  var ret = [];
+
+  for (var i=0; i<arguments.length; i++)
+    ret.push(arguments[i]);
+
+  return ret.toString();
+}
+status = inSection(8);
+actual = f8(1,2,3,4);
+expect = '1,2,3,999';
+addThis();
+
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+
+
+function addThis()
+{
+  statusitems[UBound] = status;
+  actualvalues[UBound] = actual;
+  expectedvalues[UBound] = expect;
+  UBound++;
+}
+
+
+function test()
+{
+  enterFunc('test');
+  printBugNumber(BUGNUMBER);
+  printStatus(summary);
+
+  for (var i=0; i<UBound; i++)
+  {
+    reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);
+  }
+
+  exitFunc ('test');
+}