if err != nil {
		return nil, &OpError{Op: "dial", Net: sd.network, Source: la, Addr: ra, Err: err} // c is non-nil interface containing nil pointer
	}
	return c, nil
}

// ListenConfig contains options for listening to an address.
type ListenConfig struct {
	// If Control is not nil, it is called after creating the network
	// connection but before binding it to the operating system.
	//

		if err := os.RemoveAll(d); err != nil {
			t.Error(err)
		}
	})
	return filepath.Join(d, "sock")
}

func newLocalListener(t testing.TB, network string, lcOpt ...*ListenConfig) Listener {
	var lc *ListenConfig
	switch len(lcOpt) {
	case 0:
		lc = new(ListenConfig)
	case 1:
		lc = lcOpt[0]
	default:
		t.Helper()
		t.Fatal("too many ListenConfigs passed to newLocalListener: want 0 or 1")
	}

	}
	if s.BindPort <= 0 && s.Listener == nil {
		return nil
	}

	if s.Listener == nil {
		var err error
		addr := net.JoinHostPort(s.BindAddress.String(), strconv.Itoa(s.BindPort))

		c := net.ListenConfig{}

		ctls := multipleControls{}
		if s.PermitPortSharing {
			ctls = append(ctls, permitPortReuse)
		}
		if s.PermitAddressSharing {
			ctls = append(ctls, permitAddressReuse)
		}

	}
	return c, nil
}

// TCPListener is a TCP network listener. Clients should typically
// use variables of type [Listener] instead of assuming TCP.
type TCPListener struct {
	fd *netFD
	lc ListenConfig
}

// SyscallConn returns a raw network connection.
// This implements the [syscall.Conn] interface.
//
// The returned RawConn only supports calling Control. Read and
// Write return an error.

	})

	handler := func(ls *localServer, ln Listener) {
		for {
			c, err := ln.Accept()
			if err != nil {
				return
			}
			c.Close()
		}
	}
	ln := newLocalListener(t, "tcp", &ListenConfig{
		KeepAlive: -1, // prevent calling hook from accepting
	})
	ls := (&streamListener{Listener: ln}).newLocalServer()
	defer ls.teardown()
	if err := ls.buildup(handler); err != nil {
		t.Fatal(err)
	}