package main

import (
    "context"
    "fmt"
    "math/rand"
    "time"
)
import (
    "github.com/golang/glog"
)

var aa int
func main() {
    aa = 12
    func() {
        defer func() {
            if err := recover(); err != nil {
                glog.Error(err)
            }
        }()
        aa =3
    }()
    fmt.Println(aa)
}