src/third_party/mozjs-45/js/src/jit-test/tests/debug/Debugger-onNewGlobalObject-05.js

// An onNewGlobalObject handler can disable itself.

var dbg = new Debugger;
var log;

dbg.onNewGlobalObject = function (global) {
  log += 'n';
  dbg.onNewGlobalObject = undefined;
};

log = '';
newGlobal();
assertEq(log, 'n');