tree beeb3e831841ad5f2f47425d9a9a310c03a6ae3e
parent bbddea47c314db1df8088f531ab0355915c9b564
author Dmitri Shuralyov <shurcooL@gmail.com> 1507171435 -0400
committer Russ Cox <rsc@golang.org> 1507191667 +0000

go/vcs: reject update of VCS inside VCS

Manually apply same change as CL 68110 did for cmd/go/internal/get,
but for golang.org/x/tools/go/vcs, to help keep them in sync.

Updates golang/go#22125.
Helps golang/go#11490.

Change-Id: I255f7a494d9572389fc8dc8ce96891b6fcc214a0
Reviewed-on: https://go-review.googlesource.com/68352
Reviewed-by: Russ Cox <rsc@golang.org>