n -= 8
			continue
		}
		m[i] = ^byte(0xff >> n)
		n = 0
	}
	return m
}

// Well-known IPv4 addresses
var (
	IPv4bcast     = IPv4(255, 255, 255, 255) // limited broadcast
	IPv4allsys    = IPv4(224, 0, 0, 1)       // all systems
	IPv4allrouter = IPv4(224, 0, 0, 2)       // all routers
	IPv4zero      = IPv4(0, 0, 0, 0)         // all zeros
)

// Well-known IPv6 addresses
var (

		}
	}
}

var ipAddrFamilyTests = []struct {
	in  IP
	af4 bool
	af6 bool
}{
	{IPv4bcast, true, false},
	{IPv4allsys, true, false},
	{IPv4allrouter, true, false},
	{IPv4zero, true, false},
	{IPv4(224, 0, 0, 1), true, false},
	{IPv4(127, 0, 0, 1), true, false},
	{IPv4(240, 0, 0, 1), true, false},
	{IPv6unspecified, false, true},

		{"IPMask", Type, 0},
		{"IPNet", Type, 0},
		{"IPNet.IP", Field, 0},
		{"IPNet.Mask", Field, 0},
		{"IPv4", Func, 0},
		{"IPv4Mask", Func, 0},
		{"IPv4allrouter", Var, 0},
		{"IPv4allsys", Var, 0},
		{"IPv4bcast", Var, 0},
		{"IPv4len", Const, 0},
		{"IPv4zero", Var, 0},
		{"IPv6interfacelocalallnodes", Var, 0},
		{"IPv6len", Const, 0},
		{"IPv6linklocalallnodes", Var, 0},