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 to be affected.
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