src/third_party/mozjs-45/js/src/jit-test/tests/debug/bug1109964.js

var dbgGlobal = newGlobal();
var dbg = new dbgGlobal.Debugger();
dbg.addDebuggee(this);
function f() {
  var a = arguments;
  a[1];
  dbg.getNewestFrame().eval("a");
}
f();