}
			a, err := ResolveIPAddr("ip", args[1])
			if err != nil {
				t.Errorf("ResolveIPAddr(\"ip\", %q) = %v", args[1], err)
				continue
			}
			_, err = DialIP(args[0], nil, a)
			if tt.shouldFail != (err != nil) {
				t.Errorf("DialIP(%q, %v) = %v; want (err != nil) is %t", args[0], a, err, tt.shouldFail)
			}
			_, err = ListenIP(args[0], a)
			if tt.shouldFail != (err != nil) {

	return 0, syscall.EPLAN9
}

func (c *IPConn) writeMsg(b, oob []byte, addr *IPAddr) (n, oobn int, err error) {
	return 0, 0, syscall.EPLAN9
}

func (sd *sysDialer) dialIP(ctx context.Context, laddr, raddr *IPAddr) (*IPConn, error) {
	return nil, syscall.EPLAN9
}

func (sl *sysListener) listenIP(ctx context.Context, laddr *IPAddr) (*IPConn, error) {
	return nil, syscall.EPLAN9

}

func newIPConn(fd *netFD) *IPConn { return &IPConn{conn{fd}} }

// DialIP acts like [Dial] for IP networks.
//
// The network must be an IP network name; see func Dial for details.
//
// If laddr is nil, a local address is automatically chosen.
// If the IP field of raddr is nil or an unspecified IP address, the
// local system is assumed.
func DialIP(network string, laddr, raddr *IPAddr) (*IPConn, error) {
	if raddr == nil {

	if addr == nil {
		return 0, 0, errMissingAddress
	}
	sa, err := addr.sockaddr(c.fd.family)
	if err != nil {
		return 0, 0, err
	}
	return c.fd.writeMsg(b, oob, sa)
}

func (sd *sysDialer) dialIP(ctx context.Context, laddr, raddr *IPAddr) (*IPConn, error) {
	network, proto, err := parseNetwork(ctx, sd.network, true)
	if err != nil {
		return nil, err
	}
	switch network {
	case "ip", "ip4", "ip6":

		switch network {
		case "tcp":
			_, err = DialTCP(network, nil, &TCPAddr{Port: 1 << 16})
		case "udp":
			_, err = DialUDP(network, nil, &UDPAddr{Port: 1 << 16})
		case "ip:4294967296":
			_, err = DialIP(network, nil, nil)
		case "unix", "unixpacket", "unixgram":
			_, err = DialUnix(network, nil, &UnixAddr{Name: "//"})
		}
		if err == nil {
			t.Errorf("%s: should fail", network)
			continue
		}

		} else {
			c, err = sd.dialTCP(ctx, la, ra)
		}
	case *UDPAddr:
		la, _ := la.(*UDPAddr)
		c, err = sd.dialUDP(ctx, la, ra)
	case *IPAddr:
		la, _ := la.(*IPAddr)
		c, err = sd.dialIP(ctx, la, ra)
	case *UnixAddr:
		la, _ := la.(*UnixAddr)
		c, err = sd.dialUnix(ctx, la, ra)
	default:

		{"DNSError.IsTemporary", Field, 6},
		{"DNSError.IsTimeout", Field, 0},
		{"DNSError.Name", Field, 0},
		{"DNSError.Server", Field, 0},
		{"DefaultResolver", Var, 8},
		{"Dial", Func, 0},
		{"DialIP", Func, 0},
		{"DialTCP", Func, 0},
		{"DialTimeout", Func, 0},
		{"DialUDP", Func, 0},
		{"DialUnix", Func, 0},
		{"Dialer", Type, 1},
		{"Dialer.Cancel", Field, 6},
		{"Dialer.Control", Field, 11},

pkg net, const FlagUp Flags
pkg net, const IPv4len ideal-int
pkg net, const IPv6len ideal-int
pkg net, func CIDRMask(int, int) IPMask
pkg net, func Dial(string, string) (Conn, error)
pkg net, func DialIP(string, *IPAddr, *IPAddr) (*IPConn, error)
pkg net, func DialTCP(string, *TCPAddr, *TCPAddr) (*TCPConn, error)
pkg net, func DialTimeout(string, string, time.Duration) (Conn, error)