Short variable declarations without new variables compile pass

[gopherbot]

by zhengbaiqiang:

package main

func main() {
    i, j := 1, 2
    {
        i = 10
        j = 11
        i, j := 3, 4
        println(i, j)
    }
    println(i, j)
}

What is the expected output?
expect "i, j := 3, 4" compile error, because there are no new variables on
left side of :=.

What do you see instead?
compile pass, print:
3 4
10 11

Which compiler are you using (5g, 6g, 8g, gccgo)?
8g

Which operating system are you using?
Windows

Which version are you using?  (run 'go version')
go 1.0.3

[bradfitz]

Comment 1:

Inside the braces is a new scope, so you can introduce new variables to shadow the outer
ones.

Status changed to WorkingAsIntended.