assignment to entry in nil map
func main() {
m1 := new(map[string]int)
fmt.Println(m1)
(*m1)["a"] = 1 //assignment to entry in nil map, 因为*m1的零值是nil
fmt.Println(m1)
}
func main() {
m1 := new(map[string]int)
fmt.Println(m1)
(*m1)["a"] = 1 //assignment to entry in nil map, 因为*m1的零值是nil
fmt.Println(m1)
}