}

			unspecified := tt.ip.IsUnspecified()
			if unspecified != tt.unspecified {
				t.Errorf("IsUnspecified(%v) = %v; want %v", tt.ip, unspecified, tt.unspecified)
			}
		})
	}
}

func TestAddrWellKnown(t *testing.T) {
	tests := []struct {
		name string
		ip   Addr
		std  net.IP
	}{
		{
			name: "IPv4 unspecified",
			ip:   IPv4Unspecified(),
			std:  net.IPv4zero,
		},
		{