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diff --git a/Source/JavaScriptCore/tests/mozilla/js1_2/version120/regress-99663.js b/Source/JavaScriptCore/tests/mozilla/js1_2/version120/regress-99663.js
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+/*
+* The contents of this file are subject to the Netscape Public
+* License Version 1.1 (the "License"); you may not use this file
+* except in compliance with the License. You may obtain a copy of
+* the License at http://www.mozilla.org/NPL/
+*
+* Software distributed under the License is distributed on an "AS
+* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
+* implied. See the License for the specific language governing
+* rights and limitations under the License.
+*
+* The Original Code is mozilla.org code.
+*
+* The Initial Developer of the Original Code is Netscape
+* Communications Corporation.  Portions created by Netscape are
+* Copyright (C) 1998 Netscape Communications Corporation.
+* All Rights Reserved.
+*
+* Contributor(s): brendan@mozilla.org, pschwartau@netscape.com
+* Date: 09 October 2001
+*
+* SUMMARY: Regression test for Bugzilla bug 99663
+* See http://bugzilla.mozilla.org/show_bug.cgi?id=99663
+*
+*******************************************************************************
+*******************************************************************************
+* ESSENTIAL!: this test should contain, or be loaded after, a call to
+*
+*                         version(120);
+*
+* Only JS version 1.2 or less has the behavior we're expecting here -
+*
+* Brendan: "The JS_SetVersion stickiness is necessary for tests such as
+* this one to work properly. I think the existing js/tests have been lucky
+* in dodging the buggy way that JS_SetVersion's effect can be undone by
+* function return."
+*
+* Note: it is the function statements for f1(), etc. that MUST be compiled
+* in JS version 1.2 or less for the test to pass -
+*
+*******************************************************************************
+*******************************************************************************
+*
+*
+* NOTE: the test uses the |it| object of SpiderMonkey; don't run it in Rhino -
+*
+*/
+//-----------------------------------------------------------------------------
+var UBound = 0;
+var bug = 99663;
+var summary = 'Regression test for Bugzilla bug 99663';
+/*
+ * This testcase expects error messages containing
+ * the phrase 'read-only' or something similar -
+ */
+var READONLY = /read\s*-?\s*only/;
+var READONLY_TRUE = 'a "read-only" error';
+var READONLY_FALSE = 'Error: ';
+var FAILURE = 'NO ERROR WAS GENERATED!';
+var status = '';
+var actual = '';
+var expect= '';
+var statusitems = [];
+var expectedvalues = [];
+var actualvalues = [];
+
+
+/*
+ * These MUST be compiled in JS1.2 or less for the test to work - see above
+ */
+function f1()
+{
+  with (it)
+  {
+    for (rdonly in this);
+  }
+}
+
+
+function f2()
+{
+  for (it.rdonly in this);
+}
+
+
+function f3(s)
+{
+  for (it[s] in this);
+}
+
+
+
+/*
+ * Begin testing by capturing actual vs. expected values.
+ * Initialize to FAILURE; this will get reset if all goes well -
+ */
+actual = FAILURE;
+try
+{
+  f1();
+}
+catch(e)
+{
+  actual = readOnly(e.message);
+}
+expect= READONLY_TRUE;
+status = 'Section 1 of test - got ' + actual;
+addThis();
+
+
+actual = FAILURE;
+try
+{
+  f2();
+}
+catch(e)
+{
+  actual = readOnly(e.message);
+}
+expect= READONLY_TRUE;
+status = 'Section 2 of test - got ' + actual;
+addThis();
+
+
+actual = FAILURE;
+try
+{
+  f3('rdonly');
+}
+catch(e)
+{
+  actual = readOnly(e.message);
+}
+expect= READONLY_TRUE;
+status = 'Section 3 of test - got ' + actual;
+addThis();
+
+
+
+//-----------------------------------------------------------------------------
+test();
+//-----------------------------------------------------------------------------
+
+
+
+function readOnly(msg)
+{
+  if (msg.match(READONLY))
+    return READONLY_TRUE;
+  return READONLY_FALSE + msg;
+}
+
+
+function addThis()
+{
+  statusitems[UBound] = status;
+  actualvalues[UBound] = actual;
+  expectedvalues[UBound] = expect;
+  UBound++;
+}
+
+
+function test()
+{
+  writeLineToLog ('Bug Number ' + bug);
+  writeLineToLog ('STATUS: ' + summary);
+
+  for (var i=0; i<UBound; i++)
+  {
+    writeTestCaseResult(expectedvalues[i], actualvalues[i], statusitems[i]);
+  }
+}