diff -r 000000000000 -r 6474c204b198 js/src/tests/js1_5/Regress/regress-103602.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/js/src/tests/js1_5/Regress/regress-103602.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,134 @@
+/* -*- 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:    10 Jan 2002
+ * SUMMARY: Reassignment to a const is NOT an error per ECMA
+ * See http://bugzilla.mozilla.org/show_bug.cgi?id=103602
+ *
+ * ------- Additional Comment #4 From Brendan Eich 2002-01-10 15:30 -------
+ *
+ * That's per ECMA (don't blame me, I fought for what Netscape always did:
+ * throw an error [could be a catchable exception since 1.3]).
+ * Readonly properties, when set by assignment, are not changed, but no error
+ * or exception is thrown. The value of the assignment expression is the value
+ * of the r.h.s.
+ *
+ * If you want a *strict* warning, pls change the summary of this bug
+ * to say so.
+ */
+//-----------------------------------------------------------------------------
+var UBound = 0;
+var BUGNUMBER = 103602;
+var summary = 'Reassignment to a const is NOT an error per ECMA';
+var status = '';
+var statusitems = [];
+var actual = '';
+var actualvalues = [];
+var expect= '';
+var expectedvalues = [];
+var cnFAIL_1 = 'Redeclaration of a const FAILED to cause an error';
+var cnFAIL_2 = 'Reassigning to a const caused an ERROR! It should not!!!';
+var sEval = '';
+
+/*
+ * Not every implementation supports const (a non-ECMA extension)
+ * For example, Rhino does not; it would generate a complile-time error.
+ * So we have to hide this so it will be detected at run-time instead.
+ */
+try
+{
+  sEval = 'const one = 1';
+  eval(sEval);
+}
+catch(e)
+{
+  quit(); // if const is not supported, this testcase is over -
+}
+
+
+status = inSection(1);
+try
+{
+  /*
+   * Redeclaration of const should be a compile-time error.
+   * Hide so it will be detected at run-time.
+   */
+  sEval = 'const one = 2;';
+  eval(sEval);
+
+  expect = ''; // we shouldn't reach this line
+  actual = cnFAIL_1;
+  addThis();
+}
+catch(e)
+{
+  // good - we should be here.
+  actual = expect;
+  addThis();
+}
+
+
+status = inSection(2);
+try
+{
+  /*
+   * Reassignment to a const should be NOT be an error, per ECMA.
+   */
+  one = 2;
+  actual = expect; // good: no error was generated
+  addThis();
+
+  // although no error, the assignment should have been ignored -
+  status = inSection(3);
+  actual = one;
+  expect = 1;
+  addThis();
+
+  // the value of the EXPRESSION, however, is the value of the r.h.s. -
+  status = inSection(4);
+  actual = (one = 2);
+  expect = 2;
+  addThis();
+}
+
+catch(e)
+{
+  // BAD - we shouldn't be here
+  expect = '';
+  actual = cnFAIL_2;
+  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');
+}