text: /// Copyright (c) 2012 Ecma International.  All rights reserved. 
  /// Ecma International makes this code available under the terms and conditions set
  /// forth on http://hg.ecmascript.org/tests/test262/raw-file/tip/LICENSE (the 
  /// "Use Terms").   Any redistribution of this code must retain the above 
  /// copyright and this notice and otherwise comply with the Use Terms.
  /**
   * @path ch11/11.13/11.13.2/11.13.2-54-s.js
   * @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
   * @onlyStrict
   */
  
  
  function testcase() {
          "use strict";
          var obj = {};
          Object.preventExtensions(obj);
  
          try {
              obj.len ^= 10;
              return false;
          } catch (e) {
              return e instanceof TypeError;
          }
      }
  runTestCase(testcase);
  