message: Inert conditional.
diff: @@ -274,7 +274,8 @@ suite('dynamic require', () => {
  window.addEventListener('error', on404, true);
  function on404() {
  - if (++num404s === 2) {
  + num404s++;
  + if (num404s === 2) {
  window.removeEventListener('error', on404);
  assert.equal(numCallbackCalls, 1);
  done();
  