if n := atomic.AddInt32(&p.closes, 1); n == 1 && p.Listener != nil {
		err = p.Listener.Close()
	}
	return err
}

// Issue 24803: don't call Listener.Close on Server.Shutdown.
func TestServerCloseListenerOnce(t *testing.T) {
	setParallel(t)
	defer afterTest(t)

	ln := newLocalListener(t)
	defer ln.Close()

	cl := &countCloseListener{Listener: ln}
	server := &Server{}