The Tor Browser / file revision

 /*

  * Any copyright is dedicated to the Public Domain.

  * http://creativecommons.org/licenses/publicdomain/

  */

 var gTestfile = "error-expando-reconfigure.js"

 //-----------------------------------------------------------------------------

 var BUGNUMBER = 961494;

 var summary =

   "Reconfiguring the first expando property added to an Error object " +

   "shouldn't assert";

 print(BUGNUMBER + ": " + summary);

 /**************

  * BEGIN TEST *

  **************/

 var err = new Error(); // no message argument => no err.message property

 err.expando = 17;

 Object.defineProperty(err, "expando", { configurable: false });

 /******************************************************************************/

 if (typeof reportCompare === "function")

   reportCompare(true, true);

 print("Tests complete");