go/types, types2: add test case for missing return

The respective issue was fixed in types2 with CL 356189;
and the problem didn't exist in go/types. This CL simply
adds the test case to the type checkers as well.

For #49003.

Change-Id: Ib50ee8bb0ad21f2916f2b79d4f77593302899a3e
Reviewed-on: https://go-review.googlesource.com/c/go/+/356411
Trust: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cuong Manh Le <cuong.manhle.vn@gmail.com>
2 files changed
tree: 3318a50cc59aa08fee7783f994b06f17ac45259d
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. codereview.cfg
  12. CONTRIBUTING.md
  13. CONTRIBUTORS
  14. LICENSE
  15. PATENTS
  16. README.md
  17. SECURITY.md
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