for i, tt := range parseMACTests {
		out, err := ParseMAC(tt.in)
		if !reflect.DeepEqual(out, tt.out) || !match(err, tt.err) {
			t.Errorf("ParseMAC(%q) = %v, %v, want %v, %v", tt.in, out, err, tt.out, tt.err)
		}
		if tt.err == "" {
			// Verify that serialization works too, and that it round-trips.
			s := out.String()
			out2, err := ParseMAC(s)
			if err != nil {
				t.Errorf("%d. ParseMAC(%q) = %v", i, s, err)
				continue
			}

	for i, b := range a {
		if i > 0 {
			buf = append(buf, ':')
		}
		buf = append(buf, hexDigit[b>>4])
		buf = append(buf, hexDigit[b&0xF])
	}
	return string(buf)
}

// ParseMAC parses s as an IEEE 802 MAC-48, EUI-48, EUI-64, or a 20-octet
// IP over InfiniBand link-layer address using one of the following formats:
//
//	00:00:5e:00:53:01
//	02:00:5e:10:00:00:00:01

	"ipv6",         // an IPv6 IP as parsed by Golang net.ParseIP
	"cidr",         // a CIDR as parsed by Golang net.ParseCIDR
	"mac",          // a MAC address as parsed by Golang net.ParseMAC
	"uuid",         // an UUID that allows uppercase defined by the regex (?i)^[0-9a-f]{8}-?[0-9a-f]{4}-?[0-9a-f]{4}-?[0-9a-f]{4}-?[0-9a-f]{12}$