The Tor Browser / file revision

 /// 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 ch11/11.13/11.13.2/11.13.2-19-s.js

  * @description Strict Mode - ReferenceError isn't thrown if the LeftHandSideExpression of a Compound Assignment operator(+=) evaluates to a resolvable reference

  * @onlyStrict

  */

 function testcase() {

         "use strict";

         var _11_13_2_19 = -1

         _11_13_2_19 += 10;

         return _11_13_2_19 === 9;

     }

 runTestCase(testcase);