1package main
 2
 3import (
 4	"log"
 5	"runtime"
 6)
 7
 8func check(err error) {
 9	if err != nil {
10		_, fn, line, _ := runtime.Caller(1)
11		log.Println(line)
12		log.Println(fn)
13		log.Println(err)
14	}
15}