if err != nil {
		err = &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: err}
	}
	return ifat, err
}

// MulticastAddrs returns a list of multicast, joined group addresses
// for a specific interface.
func (ifi *Interface) MulticastAddrs() ([]Addr, error) {
	if ifi == nil {
		return nil, &OpError{Op: "route", Net: "ip+net", Source: nil, Addr: nil, Err: errInvalidInterface}
	}

	if err != nil {
		t.Fatal(err)
	}
	uniStats, err := validateInterfaceUnicastAddrs(ifat)
	if err != nil {
		t.Fatal(err)
	}
	var multiStats routeStats
	for _, ifi := range ift {
		ifmat, err := ifi.MulticastAddrs()
		if err != nil {
			t.Fatal(ifi, err)
		}
		stats, err := validateInterfaceMulticastAddrs(ifmat)
		if err != nil {
			t.Fatal(ifi, err)
		}
		multiStats.ipv4 += stats.ipv4

			return true, nil // not implemented yet
		}
	}
	ift, err := Interfaces()
	if err != nil {
		return false, err
	}
	for _, ifi := range ift {
		ifmat, err := ifi.MulticastAddrs()
		if err != nil {
			return false, err
		}
		for _, ifma := range ifmat {
			if ifma.(*IPAddr).IP.Equal(ip) {
				return true, nil
			}
		}
	}
	return false, nil
}

		{"(*IPConn).WriteToIP", Method, 0},
		{"(*IPNet).Contains", Method, 0},
		{"(*IPNet).Network", Method, 0},
		{"(*IPNet).String", Method, 0},
		{"(*Interface).Addrs", Method, 0},
		{"(*Interface).MulticastAddrs", Method, 0},
		{"(*ListenConfig).Listen", Method, 11},
		{"(*ListenConfig).ListenPacket", Method, 11},
		{"(*ListenConfig).MultipathTCP", Method, 21},
		{"(*ListenConfig).SetMultipathTCP", Method, 21},

pkg net, method (*IPNet) Contains(IP) bool
pkg net, method (*IPNet) Network() string
pkg net, method (*IPNet) String() string
pkg net, method (*Interface) Addrs() ([]Addr, error)
pkg net, method (*Interface) MulticastAddrs() ([]Addr, error)
pkg net, method (*OpError) Error() string
pkg net, method (*OpError) Temporary() bool
pkg net, method (*OpError) Timeout() bool
pkg net, method (*ParseError) Error() string