The Tor Browser / file revision

 // |jit-test| debug

 // frame properties throw if !frame.live

 load(libdir + "asserts.js");

 var g = newGlobal();

 var f;

 Debugger(g).onDebuggerStatement = function (frame) {

     assertEq(frame.live, true);

     assertEq(frame.type, "call");

     assertEq(frame.this instanceof Object, true);

     assertEq(frame.older instanceof Debugger.Frame, true);

     assertEq(frame.callee instanceof Debugger.Object, true);

     assertEq(frame.generator, false);

     assertEq(frame.constructing, false);

     assertEq(frame.arguments.length, 0);

     f = frame;

 };

 g.eval("(function () { debugger; }).call({});");

 assertEq(f.live, false);

 assertThrowsInstanceOf(function () { f.type; }, Error);

 assertThrowsInstanceOf(function () { f.this; }, Error);

 assertThrowsInstanceOf(function () { f.older; }, Error);

 assertThrowsInstanceOf(function () { f.callee; }, Error);

 assertThrowsInstanceOf(function () { f.generator; }, Error);

 assertThrowsInstanceOf(function () { f.constructing; }, Error);

 assertThrowsInstanceOf(function () { f.arguments; }, Error);