x/exp/apidiff: copy changes from x/tools/internal/apidiff

We copied golang.org/x/exp/apidiff to x/tools a few months ago in
anticipation of developing gorelease in x/tools, which would depend on
apidiff.

We've decided to develop gorelease here in x/exp instead, which means
the copy in x/tools is no longer needed. This CL copies changes made
to the copy in x/tools since it was made. Another CL will delete the
copy in x/tools.

Change-Id: Ied79138616c2f3b2f49a0ee5ca95ff3179351354
Reviewed-on: https://go-review.googlesource.com/c/exp/+/197298
Run-TryBot: Jay Conrod <jayconrod@google.com>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Jonathan Amsterdam <jba@google.com>
6 files changed
tree: e610edbad449c7de624fb6bec01036ccaf438c91
  1. apidiff/
  2. cmd/
  3. ebnf/
  4. ebnflint/
  5. errors/
  6. fsnotify/
  7. inotify/
  8. io/
  9. mmap/
  10. rand/
  11. shiny/
  12. shootout/
  13. sumdb/
  14. utf8string/
  15. winfsnotify/
  16. .gitattributes
  17. .gitignore
  18. AUTHORS
  19. codereview.cfg
  20. CONTRIBUTING.md
  21. CONTRIBUTORS
  22. go.mod
  23. go.sum
  24. LICENSE
  25. PATENTS
  26. README.md
README.md

exp

This subrepository holds experimental and deprecated (in the old directory) packages.

The idea for this subrepository originated as the pkg/exp directory of the main repository, but its presence there made it unavailable to users of the binary downloads of the Go installation. The subrepository has therefore been created to make it possible to go get these packages.

Warning: Packages here are experimental and unreliable. Some may one day be promoted to the main repository or other subrepository, or they may be modified arbitrarily or even disappear altogether.

In short, code in this subrepository is not subject to the Go 1 compatibility promise. (No subrepo is, but the promise is even more likely to be violated by go.exp than the others.)

Caveat emptor.