You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: kv.pb.go
    path of file: ./repos/learning/golang/practice/go-crontab/gopath/src/github.com/coreos/etcd/mvcc/mvccpb
    
    the code of the file until where you have to start completion: // Code generated by protoc-gen-gogo. DO NOT EDIT.
// source: kv.proto

/*
	Package mvccpb is a generated protocol buffer package.

	It is generated from these files:
		kv.proto

	It has these top-level messages:
		KeyValue
		Event
*/
package mvccpb

import (
	"fmt"

	proto "github.com/golang/protobuf/proto"

	math "math"

	_ "github.com/gogo/protobuf/gogoproto"

	io "io"
)

// Reference imports to suppress errors if they are not otherwise used.
var _ = proto.Marshal
var _ = fmt.Errorf
var _ = math.Inf

// This is a compile-time assertion to ensure that this generated file
// is compatible with the proto package it is being compiled against.
// A compilation error at this line likely means your copy of the
// proto package needs to be updated.
const _ = proto.ProtoPackageIsVersion2 // please upgrade the proto package

type Event_EventType int32

const (
	PUT    Event_EventType = 0
	DELETE Event_EventType = 1
)

var Event_EventType_name = map[int32]string{
	0: "PUT",
	1: "DELETE",
}
var Event_EventType_value = map[string]int32{
	"PUT":    0,
	"DELETE": 1,
}

func (x Event_EventType) String() string {
	return proto.EnumName(Event_EventType_name, int32(x))
}
func (Event_EventType) EnumDescriptor() ([]byte, []int) { return fileDescriptorKv, []int{1, 0} }

type KeyValue struct {
	// key is the key in bytes. An empty key is not allowed.
	Key []byte `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
	// create_revision is the revision of last creation on this key.
	CreateRevision int64 `protobuf:"varint,2,opt,name=create_revision,json=createRevision,proto3" json:"create_revision,omitempty"`
	// mod_revision is the revision of last modification on this key.
	ModRevision int64 `protobuf:"varint,3,opt,name=mod_revision,json=modRevision,proto3" json:"mod_revision,omitempty"`
	// version is the version of the key. A deletion resets
	// the version to zero and any modification of the key
	// increases its version.
	Version int64 `protobuf:"varint,4,opt,name=version,proto3" json:"version,omitempty"`
	// value is the v
    
func (m *Event) Unmarshal(dAtA []byte) error {
	l := len(dAtA)
	iNdEx := 0
	for iNdEx < l {
		preIndex := iNdEx
		var wire uint64
		for shift := uint(0); ; shift += 7 {
			if shift >= 64 {
				return ErrIntOverflowKv
			}
			if iNdEx >= l {
				return io.ErrUnexpectedEOF
			}
			b := dAtA[iNdEx]
			iNdEx++
			wire |= (uint64(b) & 0x7F) << shift
			if b < 0x80 {
				break
			}
		}
		fieldNum := int32(wire >> 3)
		wireType := int(wire & 0x7)
		if wireType == 4 {
			return fmt.Errorf("proto: Event: wiretype end group for non-group")
		}
		if fieldNum <= 0 {
			return fmt.Errorf("proto: Event: illegal tag %d (wire type %d)", fieldNum, wire)
		}
		switch fieldNum {
		case 1:
			if wireType != 0 {
				return fmt.Errorf("proto: wrong wireType = %d for field Type", wireType)
			}
			m.Type = 0
			for shift := uint(0); ; shift += 7 {
				if shift >= 64 {
					return ErrIntOverflowKv
				}
				if iNdEx >= l {
					return io.ErrUnexpectedEOF
				}
				b := dAtA[iNdEx]
				iNdEx++
				m.Type |= (Event_EventType(b) & 0x7F) << shift
				if b < 0x80 {
					break
				}
			}
		case 2:
			if wireType != 2 {
				return fmt.Errorf("proto: wrong wireType = %d for field Kv", wireType)
			}
			var msglen int
			for shift := uint(0); ; shift += 7 {
				if shift >= 64 {
					return ErrIntOverflowKv
				}
				if iNdEx >= l {
					return io.ErrUnexpectedEOF
				}
				b := dAtA[iNdEx]
				iNdEx++
				msglen |= (int(b) & 0x7F) << shift
				if b < 0x80 {
					break
				}
			}
			if msglen < 0 {
				return ErrInvalidLengthKv
			}
			postIndex := iNdEx + msglen
			if postIndex > l {
				return io.ErrUnexpectedEOF
			}
			if m.Kv == nil {
				m.Kv = &KeyValue{}
			}
			if err := m.Kv.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
				return err
			}
			iNdEx = postIndex
		case 3:
			if wireType != 2 {
				return fmt.Errorf("proto: wrong wireType = %d for field PrevKv", wireType)
			}
			var msglen int
			for shift := uint(0); ; shift += 7 {
				if shift >= 64 {
					return ErrIntOverflowKv
				}
				if iNdEx >= l {
					return io.ErrUnexpectedEOF
				}
				b := dAtA[iNdEx]
				iNdEx++
				msglen |= (int(b) & 0x7F) << shift
				if b < 0x80 {
					break
				}
			}
			if msglen < 0 {
				return ErrInvalidLengthKv
			}
			postIndex := iNdEx + msglen
			if postIndex > l {
				return io.ErrUnexpectedEOF
			}
			if m.PrevKv == nil {
				m.PrevKv = &KeyValue{}
			}
			if err := m.PrevKv.Unmarshal(dAtA[iNdEx:postIndex]); err != nil {
				return err
			}
			iNdEx = postIndex
		default:
			iNdEx = preIndex
			skippy, err := skipKv(dAtA[iNdEx:])
			if err != nil {
				return err
			}
			if skippy < 0 {
				return ErrInvalidLengthKv
			}
			if (iNdEx + skippy) > l {
				return io.ErrUnexpectedEOF
			}
			iNdEx += skippy
		}
	}

	if iNdEx > l {
		return io.ErrUnexpectedEOF
	}
	return nil
}