package mainimport ("fmt""time")func panic_test(){defer func() {	fmt.Println("no")//		if e := recover(); e != nil {//			fmt.Println("some wrong:", e)//		}}()z := 0zero := 1/zfmt.Println(zero)}func main() {panic_test()go func() {	for a := range time.Tick(1e9) {		fmt.Printf("cur conn num: %v\n", a)	}}()list := []string{"a","b","c","d"}//fmt.Printf("in main, list addr is %p \r\n", list)go func( list []string)	{	//fmt.Printf("in goruotine, list addr is %p \r\n", list)	time.Sleep(1e9)	(list)[2] = "CC"	list = append(list,"FF")	for i, c := range list{		fmt.Println( "in go", i, c)	}}(list)for i, c := range list{	fmt.Println( i, c)	time.Sleep(1e9)}fmt.Println( "second printf")for i, c := range list{	fmt.Println( i, c)	//time.Sleep(1e9)}for{time.Sleep(1e5)}}