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 ch10/10.6/10.6-6-1.js

  * @description 'length property of arguments object exists

  */

 function testcase() {

   var desc = Object.getOwnPropertyDescriptor(arguments,"length");

   return desc !== undefined

  }

 runTestCase(testcase);