[go-nuts] Use and redeclare same variable in block

[Wenbin Shang]

The following code:

package main

import "fmt"

func main() {
    var i int
    fmt.Println(i)
    if true {
        i = 5
        i, j := 3, 4
        fmt.Println(i, j)
    }
    fmt.Println(i)
}

Output:
0
3 4
5

Is this a reasonable behavior? I intuitively thought only j is declared in 
if block and i will be the same as outer one.

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