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: error.go
    path of file: ./repos/goldfish/vendor/github.com/lib/pq
    
    the code of the file until where you have to start completion: package pq

import (
	"database/sql/driver"
	"fmt"
	"io"
	"net"
	"runtime"
)

// Error severities
const (
	Efatal   = "FATAL"
	Epanic   = "PANIC"
	Ewarning = "WARNING"
	Enotice  = "NOTICE"
	Edebug   = "DEBUG"
	Einfo    = "INFO"
	Elog     = "LOG"
)

// Error represents an error communicating with the server.
//
// See http://www.postgresql.org/docs/current/static/protocol-error-fields.html for details of the fields
type Error struct {
	Severity         string
	Code             ErrorCode
	Message          string
	Detail           string
	Hint             string
	Position      
    
func parseError(r *readBuf) *Error {
	err := new(Error)
	for t := r.byte(); t != 0; t = r.byte() {
		msg := r.string()
		switch t {
		case 'S':
			err.Severity = msg
		case 'C':
			err.Code = ErrorCode(msg)
		case 'M':
			err.Message = msg
		case 'D':
			err.Detail = msg
		case 'H':
			err.Hint = msg
		case 'P':
			err.Position = msg
		case 'p':
			err.InternalPosition = msg
		case 'q':
			err.InternalQuery = msg
		case 'W':
			err.Where = msg
		case 's':
			err.Schema = msg
		case 't':
			err.Table = msg
		case 'c':
			err.Column = msg
		case 'd':
			err.DataTypeName = msg
		case 'n':
			err.Constraint = msg
		case 'F':
			err.File = msg
		case 'L':
			err.Line = msg
		case 'R':
			err.Routine = msg
		}
	}
	return err
}