func main() {
	defer func() {
		if r := recover(); r != nil {
			fmt.Println("recover()")
		}
		return
	}()
	g, _ := errgroup.WithContext(context.Background())
	g.Go(func() error {
		panic("this is a panic")
	})

	if err := g.Wait(); err != nil {
		fmt.Println("occur err")
		return
	}
	time.Sleep(500 * time.Millisecond)
	fmt.Println("success")
	return
}