// and MaxPathLenZero are valid.
	BasicConstraintsValid bool
	IsCA                  bool

	// MaxPathLen and MaxPathLenZero indicate the presence and
	// value of the BasicConstraints' "pathLenConstraint".
	//
	// When parsing a certificate, a positive non-zero MaxPathLen
	// means that the field was specified, -1 means it was unset,
	// and MaxPathLenZero being true mean that the field was

	}
	if cert1.MaxPathLenZero {
		t.Errorf("Omitting MaxPathLen resulted in MaxPathLenZero")
	}

	template.MaxPathLen = 1
	cert2 := serialiseAndParse(t, template)
	if m := cert2.MaxPathLen; m != 1 {
		t.Errorf("Setting MaxPathLen didn't work. Got %d but set 1", m)
	}
	if cert2.MaxPathLenZero {
		t.Errorf("Setting MaxPathLen resulted in MaxPathLenZero")
	}

	template.MaxPathLen = 0

pkg crypto/tls, type ConnectionState struct, TLSUnique []uint8

# CL 153420045 crypto/x509: continue to recognise MaxPathLen of zero as "no value"., Adam Langley <******@****.***>
pkg crypto/x509, type Certificate struct, MaxPathLenZero bool

# CL 158950043 database/sql: add Drivers, returning list of registered drivers, Russ Cox <******@****.***>
pkg database/sql, func Drivers() []string

					return err
				}
			case 19:
				out.IsCA, out.MaxPathLen, err = parseBasicConstraintsExtension(e.Value)
				if err != nil {
					return err
				}
				out.BasicConstraintsValid = true
				out.MaxPathLenZero = out.MaxPathLen == 0
			case 17:
				out.DNSNames, out.EmailAddresses, out.IPAddresses, out.URIs, err = parseSANExtension(e.Value)
				if err != nil {
					return err
				}

		{"Certificate.Issuer", Field, 0},
		{"Certificate.IssuingCertificateURL", Field, 2},
		{"Certificate.KeyUsage", Field, 0},
		{"Certificate.MaxPathLen", Field, 0},
		{"Certificate.MaxPathLenZero", Field, 4},
		{"Certificate.NotAfter", Field, 0},
		{"Certificate.NotBefore", Field, 0},
		{"Certificate.OCSPServer", Field, 2},
		{"Certificate.PermittedDNSDomains", Field, 0},