var resultChanWG sync.WaitGroup
	resultChanWG.Add(1)
	go wc.processEvent(&resultChanWG)

	select {
	case err := <-wc.errChan:
		if isCancelError(err) {
			break
		}
		errResult := transformErrorToEvent(err)
		if errResult != nil {
			// error result is guaranteed to be received by user before closing ResultChan.
			select {
			case wc.resultChan <- *errResult: