_      = flag.Bool("ipv6", false, "")

	echConfigListB64           = flag.String("ech-config-list", "", "")
	expectECHAccepted          = flag.Bool("expect-ech-accept", false, "")
	expectHRR                  = flag.Bool("expect-hrr", false, "")
	expectedECHRetryConfigs    = flag.String("expect-ech-retry-configs", "", "")
	expectNoECHRetryConfigs    = flag.Bool("expect-no-ech-retry-configs", false, "")

	if hs.c.quic != nil {
		return nil
	}
	if hs.sentDummyCCS {
		return nil
	}
	hs.sentDummyCCS = true

	return hs.c.writeChangeCipherRecord()
}

// processHelloRetryRequest handles the HRR in hs.serverHello, modifies and
// resends hs.hello, and reads the new ServerHello into hs.serverHello.
func (hs *clientHandshakeStateTLS13) processHelloRetryRequest() error {
	c := hs.c

			if test.expectHRR {
				if !ss.testingOnlyDidHRR {
					t.Error("server did not use HRR")
				}
				if !cs.testingOnlyDidHRR {
					t.Error("client did not use HRR")
				}
			} else {
				if ss.testingOnlyDidHRR {
					t.Error("server used HRR")
				}
				if cs.testingOnlyDidHRR {
					t.Error("client used HRR")
				}
			}
		})
	}
}

        "NoNullCompression-TLS12": "TODO: first pass, this should be fixed",
        "KeyUpdate-RequestACK": "TODO: first pass, this should be fixed",
        "TLS13-HRR-InvalidCompressionMethod": "TODO: first pass, this should be fixed",
        "InvalidCompressionMethod": "TODO: first pass, this should be fixed",

			}
		case extensionCookie:
			if !readUint16LengthPrefixed(&extData, &m.cookie) ||
				len(m.cookie) == 0 {
				return false
			}
		case extensionKeyShare:
			// This extension has different formats in SH and HRR, accept either
			// and let the handshake logic decide. See RFC 8446, Section 4.2.8.
			if len(extData) == 2 {
				if !extData.ReadUint16((*uint16)(&m.selectedGroup)) {
					return false
				}
			} else {