go/types: add commentMap and test

This adds the (adjusted) syntax.CommentMap function and corresponding
test to the types_test package so that we can use it for collecting
ERROR comments in the next CL.

For #51006.

Change-Id: I63ce96e7394c28c02d5a292250586cc49c1f6e19
Reviewed-on: https://go-review.googlesource.com/c/go/+/456125
Reviewed-by: Robert Findley <rfindley@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Robert Griesemer <gri@google.com>
Auto-Submit: Robert Griesemer <gri@google.com>
Run-TryBot: Robert Griesemer <gri@google.com>
1 file changed
tree: af94733884483065c7fbf02279b7b5b8a09a6e8f
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. codereview.cfg
  11. CONTRIBUTING.md
  12. LICENSE
  13. PATENTS
  14. README.md
  15. SECURITY.md
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