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: entry.go
    path of file: ./repos/lazydocker/vendor/github.com/sirupsen/logrus
    
    the code of the file until where you have to start completion: package logrus

import (
	"bytes"
	"context"
	"fmt"
	"os"
	"reflect"
	"runtime"
	"strings"
	"sync"
	"time"
)

var (
	bufferPool *sync.Pool

	// qualified package name, cached at first use
	logrusPackage string

	// Positions in 
    
func (entry *Entry) WithFields(fields Fields) *Entry {
	data := make(Fields, len(entry.Data)+len(fields))
	for k, v := range entry.Data {
		data[k] = v
	}
	fieldErr := entry.err
	for k, v := range fields {
		isErrField := false
		if t := reflect.TypeOf(v); t != nil {
			switch t.Kind() {
			case reflect.Func:
				isErrField = true
			case reflect.Ptr:
				isErrField = t.Elem().Kind() == reflect.Func
			}
		}
		if isErrField {
			tmp := fmt.Sprintf("can not add field %q", k)
			if fieldErr != "" {
				fieldErr = entry.err + ", " + tmp
			} else {
				fieldErr = tmp
			}
		} else {
			data[k] = v
		}
	}
	return &Entry{Logger: entry.Logger, Data: data, Time: entry.Time, err: fieldErr, Context: entry.Context}
}