code: func (f *RaceFreeFakeWatcher) Error(errValue runtime.Object) {
  	f.Lock()
  	defer f.Unlock()
  	if !f.Stopped {
  		select {
  		case f.result <- Event{Error, errValue}:
  			return
  		default:
  			panic(fmt.Errorf("channel full"))
  		}
  	}
  }
docs: // Error sends an Error event.