resolveUDPAddrTests = append(resolveUDPAddrTests, resolveUDPAddrTest{"udp6", "localhost:3", &UDPAddr{IP: IPv6loopback, Port: 3}, nil})
		resolveIPAddrTests = append(resolveIPAddrTests, resolveIPAddrTest{"ip6", "localhost", &IPAddr{IP: IPv6loopback}, nil})

		// Issue 20911: don't return IPv4 addresses for

		{"udp", "golang.org"},
	}
	results := map[[2]string][]IPAddr{
		{"udp", "golang.org"}: {
			{IP: IPv4(127, 0, 0, 1)},
			{IP: IPv6loopback},
		},
		{"udp4", "golang.org"}: {
			{IP: IPv4(127, 0, 0, 1)},
		},
		{"udp6", "golang.org"}: {
			{IP: IPv6loopback},
		},
	}
	calls := int32(0)
	waitCh := make(chan struct{})

		{
			name:     "loopback v4Addr",
			ip:       loopback4,
			loopback: true,
		},
		{
			name:     "loopback v6Addr",
			ip:       IPv6Loopback(),
			loopback: true,
		},
		{
			name:     "loopback v6 mapped v4Addr",
			ip:       AddrFrom16(IPv6Loopback().As16()),
			loopback: true,
		},
		{
			name:                    "interface-local multicast v6Addr",
			ip:                      ilm6,

)

// Well-known IPv6 addresses
var (
	IPv6zero                   = IP{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
	IPv6unspecified            = IP{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0}
	IPv6loopback               = IP{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1}
	IPv6interfacelocalallnodes = IP{0xff, 0x01, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0x01}

//
// Do not remove or change the type signature.
// See go.dev/issue/67401.
//
//go:linkname loopbackIP
func loopbackIP(net string) IP {
	if net != "" && net[len(net)-1] == '6' {
		return IPv6loopback
	}
	return IP{127, 0, 0, 1}

// IPv6LinkLocalAllRouters returns the IPv6 link-local all routers multicast
// address ff02::2.
func IPv6LinkLocalAllRouters() Addr { return AddrFrom16([16]byte{0: 0xff, 1: 0x02, 15: 0x02}) }

// IPv6Loopback returns the IPv6 loopback address ::1.
func IPv6Loopback() Addr { return AddrFrom16([16]byte{15: 0x01}) }

// IPv6Unspecified returns the IPv6 unspecified address "::".
func IPv6Unspecified() Addr { return Addr{z: z6noz} }

	}
	in := &CertificateRequest{
		DNSNames:       []string{"example.com", "example.org"},
		EmailAddresses: []string{"******@****.***", "******@****.***"},
		IPAddresses:    []net.IP{net.IPv4(192, 0, 2, 0), net.IPv6loopback},
		URIs:           []*url.URL{urlA, urlB},
	}
	out := marshalAndParseCSR(t, in)

	if !reflect.DeepEqual(in.DNSNames, out.DNSNames) {