package main

import (
	"fmt"
	"github.com/pkg/errors"
)

func error1() error {
	return errors.New("error1")
}

func error2() (err error) {
	err = error1()
	if err != nil {
		return errors.Wrap(err, "error2")
	}
	return
}

func error3() (err error) {
	return
}

func main() {
	err := error2()
	if err != nil {
		fmt.Println(err)
	}
	err = error3()
	if err != nil {
		fmt.Println(err)
	}
}