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: tmpl.go
    path of file: ./repos/fq/dev
    
    the code of the file until where you have to start completion: package main

import (
	"encoding/json"
	"errors"
	"io"
	"log"
	"os"
	"strconv"
	"strings"
	"text/template"
)

func toInt(v any) int {
	switch v := v.(type) {
	case float64:
		return int(v)
	case int:
		return v
	default:
		return 0
	}
}

func toString(v any) string {
	switch v := v.(type) {
	case string:
		return v
	case int:
		return strconv.Itoa(v)
	default:
		return ""
	}
}

func main() {
	funcMap := template.FuncMap{
		"xrange": func(args ...any) (any, error) {
			if len(args) < 2 {
				return nil, errors.New("need min and max argument")
			}

			min := toInt(args[0])
			max := toInt(args[1])
			var v []int
			for i := min; i < max; i++ {
				v = append(v, i)
			}

			return v, nil
		},
		"replace": func(args ...any) (any, error) {
			if len(args) < 3 {
				return nil, errors.New("need tmpl, old and new argument")
			}

			s := toString(args[0])
			o := toString(args[1])
			n := toString(args[2])

			return strings.Replace(s, o, n, -1), nil
		},
		"slice": func(args ...any) []any
    
func main() {
	funcMap := template.FuncMap{
		"xrange": func(args ...any) (any, error) {
			if len(args) < 2 {
				return nil, errors.New("need min and max argument")
			}

			min := toInt(args[0])
			max := toInt(args[1])
			var v []int
			for i := min; i < max; i++ {
				v = append(v, i)
			}

			return v, nil
		},
		"replace": func(args ...any) (any, error) {
			if len(args) < 3 {
				return nil, errors.New("need tmpl, old and new argument")
			}

			s := toString(args[0])
			o := toString(args[1])
			n := toString(args[2])

			return strings.Replace(s, o, n, -1), nil
		},
		"slice": func(args ...any) []any {
			return args
		},
		"map": func(args ...any) map[any]any {
			m := map[any]any{}
			for i := 0; i < len(args)/2; i++ {
				m[args[i*2]] = args[i*2+1]
			}
			return m
		},
	}

	data := map[string]any{}
	if len(os.Args) > 1 {
		r, err := os.Open(os.Args[1])
		if err != nil {
			log.Fatalf("%s: %s", os.Args[1], err)
		}
		defer r.Close()
		_ = json.NewDecoder(r).Decode(&data)
	}

	templateBytes, err := io.ReadAll(os.Stdin)
	if err != nil {
		panic(err)
	}
	templateStr := string(templateBytes)

	tmpl, err := template.New("").Funcs(funcMap).Parse(templateStr)
	if err != nil {
		log.Fatalf("template.New: %s", err)
	}

	err = tmpl.Execute(os.Stdout, &data)
	if err != nil {
		log.Fatalf("tmpl.Execute: %s", err)
	}
}