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7460b8e10b
`go tools vet -shadow` ignored the case like this form
```golang
func shadowBlock() {
var a int
{
var a = 3
_ = a
}
_ = a
}
```
This commit fix it on "idiomaticRedecl" func, and add the code above in testcase.
Change-Id: I007f8287766f59cd7ded86072ba6bf6743c392be
GitHub-Last-Rev: b8b302b2048d709a39fb17496ba80917f9f4c889
GitHub-Pull-Request: golang/tools#143
Reviewed-on: https://go-review.googlesource.com/c/tools/+/189158
Run-TryBot: Rebecca Stambler <rstambler@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Rebecca Stambler <rstambler@golang.org>