types2, go/types: fix conversion error for pointer to type param

During conversion checking, assignableTo probes pointer-to-interface
targets to produce a helpful diagnostic. Because type parameters have
interface underlying types, that probe also matches targets such as *P
where P is a type parameter.

Use interfacePtrError when Checker.implements formats this diagnostic so
that pointer-to-type-parameter targets are reported accurately instead of
as plain pointer-to-interface targets. Add a fixedbugs test for
conversions to *P.

Fixes #79883

Change-Id: Ie2c5860b6a13a782442716eac6276a97310f6ee3
Reviewed-on: https://go-review.googlesource.com/c/go/+/787900
Reviewed-by: Mark Freeman <markfreeman@google.com>
Reviewed-by: Robert Griesemer <gri@google.com>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Mark Freeman <markfreeman@google.com>
3 files changed
tree: fbbb63f5b331f0d57de83637400ae2fa5d1c3ff2
  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. go.env
  13. LICENSE
  14. PATENTS
  15. README.md
  16. SECURITY.md
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