buf := make([]byte, 8)

	_, _, err = conn.WriteMsgUDPAddrPort(buf, nil, daddr4)
	if err != nil {
		t.Fatal(err)
	}

	_, _, err = conn.WriteMsgUDPAddrPort(buf, nil, daddr4in6)
	if err != nil {
		t.Fatal(err)
	}

	_, _, err = conn.WriteMsgUDPAddrPort(buf, nil, daddr6)
	if err != nil {
		t.Fatal(err)
	}

	if err != nil {
		err = &OpError{Op: "write", Net: c.fd.net, Source: c.fd.laddr, Addr: addr.opAddr(), Err: err}
	}
	return
}

// WriteMsgUDPAddrPort is like WriteMsgUDP but takes a netip.AddrPort instead of a UDPAddr.
func (c *UDPConn) WriteMsgUDPAddrPort(b, oob []byte, addr netip.AddrPort) (n, oobn int, err error) {
	if !c.ok() {
		return 0, 0, syscall.EINVAL
	}
	n, oobn, err = c.writeMsgAddrPort(b, oob, addr)

pkg net, method (*UDPConn) ReadFromUDPAddrPort([]uint8) (int, netip.AddrPort, error)
pkg net, method (*UDPConn) ReadMsgUDPAddrPort([]uint8, []uint8) (int, int, int, netip.AddrPort, error)
pkg net, method (*UDPConn) WriteMsgUDPAddrPort([]uint8, []uint8, netip.AddrPort) (int, int, error)
pkg net, method (*UDPConn) WriteToUDPAddrPort([]uint8, netip.AddrPort) (int, error)
pkg net, type Error interface, Temporary //deprecated

		{"(*UDPConn).SetWriteDeadline", Method, 0},
		{"(*UDPConn).SyscallConn", Method, 9},
		{"(*UDPConn).Write", Method, 0},
		{"(*UDPConn).WriteMsgUDP", Method, 1},
		{"(*UDPConn).WriteMsgUDPAddrPort", Method, 18},
		{"(*UDPConn).WriteTo", Method, 0},
		{"(*UDPConn).WriteToUDP", Method, 0},
		{"(*UDPConn).WriteToUDPAddrPort", Method, 18},
		{"(*UnixAddr).Network", Method, 0},