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: lexer.go
    path of file: ./repos/gogll/test/lex/lex5/lexer
    
    the code of the file until where you have to start completion: 
// Package lexer is generated by GoGLL. Do not edit.
package lexer

import (
	// "fmt"
	"io/ioutil"
	"strings"
	"unicode"

	"github.com/goccmack/gogll/v3/test/lex/lex5/toke
    
func NewFile(fname string) *Lexer {
	buf, err := ioutil.ReadFile(fname)
	if err != nil {
		panic(err)
	}
	input := []rune(string(buf))
	if strings.HasSuffix(fname, ".md") {
		loadMd(input)
	}
	return New(input)
}