This reverts commit aff37662.

Reason: Decision to back out current alias implementation.
https://github.com/golang/go/issues/16339#issuecomment-258527920

Fixes #16339.
Fixes #17746.
Fixes #17784.

Change-Id: I5737b830d7f6fb79cf36f26403b4ad8533ba1dfe
Reviewed-on: https://go-review.googlesource.com/32813Reviewed-by: Russ Cox <rsc@golang.org>
Reviewed-by: Rob Pike <r@golang.org>