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/// Copyright (c) 2012 Ecma International. All rights reserved.
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/// Ecma International makes this code available under the terms and conditions set
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/// forth on http://hg.ecmascript.org/tests/test262/raw-file/tip/LICENSE (the
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/// "Use Terms"). Any redistribution of this code must retain the above
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/// copyright and this notice and otherwise comply with the Use Terms.
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* @path ch11/11.13/11.13.2/11.13.2-50-s.js
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* @description Strict Mode - TypeError is thrown if The LeftHandSide of a Compound Assignment operator(<<=) is a reference to a non-existent property of an object whose [[Extensible]] internal property if false
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Object.preventExtensions(obj);
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return e instanceof TypeError;
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runTestCase(testcase);