The Tor Browser / file revision

 // |reftest| require-or(debugMode,skip)

 /*

  * Any copyright is dedicated to the Public Domain.

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

  */

 var BUGNUMBER = 549617;

 var summary = 'flat closure debugged via trap while still active';

 var expect = "abc";

 var actual = expect;

 function a(x, y) {

     return function () { return x; };

 }

 var f = a("abc", 123);

 if (this.trap && this.setDebug) {

     setDebug(true);

     trap(f, "try {actual = x} catch (e) {actual = e}");

 }

 f();

 reportCompare(expect, actual, summary);

 printStatus("All tests passed!");