The Tor Browser / file revision

 // When a termination is propagated out of multiple frames, their onPop

 // handlers are called in the correct order, and no onExceptionUnwind

 // handlers are called.

 var g = newGlobal();

 g.eval("function f() { terminate(); }");

 g.eval("function g() { f(); }");

 g.eval("function h() { g(); }");

 g.eval("function i() { h(); }");

 var dbg = new Debugger(g);

 var log;

 var count = 0;

 function makePopHandler(label, resumption) {

     return function handlePop(completion) { 

         log += label;

         assertEq(completion, null);

         return resumption;

     };

 }

 dbg.onEnterFrame = function handleEnter(f) {

     log += "(" + f.callee.name;

     f.onPop = makePopHandler(f.callee.name + ")",

                              count++ == 0 ? { return: 'king' } : undefined);

 };

 dbg.onExceptionUnwind = function handleExceptionUnwind(f, x) {

     log += 'u';  

 };

 log = '';

 assertEq(g.i(), 'king');

 assertEq(log, "(i(h(g(ff)g)h)i)");