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.

 /**

  * This test is actually testing the [[Delete]] internal method (8.12.8). Since the

  * language provides no way to directly exercise [[Delete]], the tests are placed here.

  *

  * @path ch11/11.4/11.4.1/11.4.1-4.a-8.js

  * @description delete operator returns true for built-in objects (JSON)

  */

 function testcase() {

   try {

       var o = JSON;

       var d = delete JSON;  

       if (d === true) {	    

         return true;

       }

   } finally {

     JSON = o;

   }

  }

 runTestCase(testcase);