なぜ同時実行のためにチャネルを使用しないのですか?

<code class="go">newConns := make(chan net.Conn)

// For every listener, spawn a goroutine that accepts connections
for _, l := range listeners {
    go func(l net.Listener) {
        for {
            c, err := l.Accept()
            if err != nil {
                // Handle error
                newConns <- nil
                return
            }
            newConns <- c
        }
    }(l)
}

// Multiplex the channel with a timer
for {
    select {
    case c := <-newConns:
        // Handle new connection or nil (if an acceptor is down)
    case <-time.After(time.Minute):
        // Timeout branch
    }
}</code>