<!DOCTYPE HTML> <html> <head> <meta charset='utf-8'/> <title>Debugger Test for Inspecting Optimized-Out Variables</title> <!-- Any copyright is dedicated to the Public Domain. http://creativecommons.org/publicdomain/zero/1.0/ --> <script type="text/javascript"> window.addEventListener("load", function onload() { window.removeEventListener("load", onload); function clickHandler(event) { button.removeEventListener("click", clickHandler, false); function outer(arg) { var upvar = arg * 2; // The inner lambda only aliases arg, so the frontend alias analysis decides // that upvar is not aliased and is not in the CallObject. return function () { arg += 2; }; } var f = outer(42); f(); } var button = document.querySelector("button"); button.addEventListener("click", clickHandler, false); }); </script> </head> <body> <button>Click me!</button> </body> </html>