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/kubeedge/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 field
    
func (cn *conn) errRecover(err *error) {
	e := recover()
	switch v := e.(type) {
	case nil:
		// Do nothing
	case runtime.Error:
		cn.err.set(driver.ErrBadConn)
		panic(v)
	case *Error:
		if v.Fatal() {
			*err = driver.ErrBadConn
		} else {
			*err = v
		}
	case *net.OpError:
		cn.err.set(driver.ErrBadConn)
		*err = v
	case *safeRetryError:
		cn.err.set(driver.ErrBadConn)
		*err = driver.ErrBadConn
	case error:
		if v == io.EOF || v.Error() == "remote error: handshake failure" {
			*err = driver.ErrBadConn
		} else {
			*err = v
		}

	default:
		cn.err.set(driver.ErrBadConn)
		panic(fmt.Sprintf("unknown error: %#v", e))
	}

	// Any time we return ErrBadConn, we need to remember it since *Tx doesn't
	// mark the connection bad in database/sql.
	if *err == driver.ErrBadConn {
		cn.err.set(driver.ErrBadConn)
	}
}