I wrote this code, and why `map=nil` don't stop the loop?
```go
func mapTest() {
m := map[int]int{1: 1, 2: 2}
for k, v := range m {
println(k, v)
m = nil
}
}
```
output:
1 1
2 2
I don't understand when I set `m = nil`, the loop is not stop. m doesn't
seem
* sheepbao [180115 21:24]:
> I wrote this code, and why `map=nil` don't stop the loop?
>
> func mapTest() {
> for k, v := range m {
> println(k, v)
> m = nil
> }
> }
>
> output:
>
> 1 1
>
> 2 2
>
> I don't understand when I set `m = nil`, the loop is not stop. m doesn
