[release-branch.go1.8] cmd/go: correct directory used in checkNestedVCS test

This error was not used when using git because nested git is permitted.
Add test using Mercurial, so that at least we have a test, even though
the test is not run by default.

Fixes #22157
Fixes #22201

Change-Id: If521f3c09b0754e00e56fa3cd0364764a57a43ad
Reviewed-on: https://go-review.googlesource.com/69670
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Russ Cox <rsc@golang.org>
2 files changed
tree: 6ce84be8c62e04d9069da5c8faebe47b7c275d17
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. CONTRIBUTING.md
  12. CONTRIBUTORS
  13. favicon.ico
  14. LICENSE
  15. PATENTS
  16. README.md
  17. robots.txt
  18. VERSION
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