The Tor Browser / file revision

 // Test that we can save stacks with self-hosted function frames in them.

 const map = (function () {

   return [3].map(n => saveStack()).pop();

 }());

 assertEq(map.parent.functionDisplayName, "map");

 assertEq(map.parent.source, "self-hosted");

 const reduce = (function () {

   return [3].reduce(() => saveStack(), 3);

 }());

 assertEq(reduce.parent.functionDisplayName, "reduce");

 assertEq(reduce.parent.source, "self-hosted");

 const forEach = (function () {

   try {

     [3].forEach(n => { throw saveStack() });

   } catch (s) {

     return s;

   }

 }());

 assertEq(forEach.parent.functionDisplayName, "forEach");

 assertEq(forEach.parent.source, "self-hosted");