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diff --git a/js/src/tests/ecma_3/Object/regress-72773.js b/js/src/tests/ecma_3/Object/regress-72773.js
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+/* -*- indent-tabs-mode: nil; js-indent-level: 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: 09 May 2001
+ *
+ * SUMMARY: Regression test: we shouldn't crash on this code
+ * See http://bugzilla.mozilla.org/show_bug.cgi?id=72773
+ *
+ * See ECMA-262 Edition 3 13-Oct-1999, Section 8.6.2 re [[Class]] property.
+ *
+ * Same as class-001.js - but testing user-defined types here, not
+ * native types. Therefore we expect the [[Class]] property to equal
+ * 'Object' in each case -
+ *
+ * The getJSClass() function we use is in a utility file, e.g. "shell.js"
+ */
+//-----------------------------------------------------------------------------
+var BUGNUMBER = 72773;
+var summary = "Regression test: we shouldn't crash on this code";
+var status = '';
+var actual = '';
+var expect = '';
+var sToEval = '';
+
+/*
+ * This code should produce an error, but not a crash.
+ * 'TypeError: Function.prototype.toString called on incompatible object'
+ */
+sToEval += 'function Cow(name){this.name = name;}'
+sToEval += 'function Calf(str){this.name = str;}'
+sToEval += 'Calf.prototype = Cow;'
+sToEval += 'new Calf().toString();'
+
+status = 'Trying to catch an expected error';
+try
+{
+ eval(sToEval);
+}
+catch(e)
+{
+ actual = getJSClass(e);
+ expect = 'Error';
+}
+
+
+//----------------------------------------------------------------------------------------------
+test();
+//----------------------------------------------------------------------------------------------
+
+
+function test()
+{
+ enterFunc ('test');
+ printBugNumber(BUGNUMBER);
+ printStatus (summary);
+
+ reportCompare(expect, actual, status);
+
+ exitFunc ('test');
+}