go通道返回给return

package update

func main() {
    resultWorkerErr := make(chan error)
    defer close(resultWorkerErr)
    go func() {
       defer cancel()
       resultWorkerErr <- b.resultWorker(ctx)
    }()

    err := b.worker(ctx)
    cancel()
    if err == nil {
       return <-resultWorkerErr
    }
    return multierror.Append(err, <-resultWorkerErr)
}