cmd/go2go: compilation fails if mutiple packages with the same name are imported

[DeedleFake]

Playground

package main

import (
    crand "crypto/rand"
    "math/rand"
)

func main() {
    _ = crand.Reader
    _ = rand.Source(nil)
}

Output:

./prog.go2:4: rand redeclared as imported package name
    previous declaration at ./prog.go2:4

[gopherbot]

Change https://golang.org/cl/244621 mentions this issue: [dev.go2go] go/go2go: don't import renamed package twice

[ianlancetaylor]

Thanks. Fixed on go2go branch.

I'm sure there are cases using local import aliases that will fail with the translation tool. But we can fix this one, at least.