go/types, types2: copy test from issue48703 into its own file

Monomorphization checks do not run in the presence of errors, which was
suppressing the error from this test and making it appear to pass. This
is a bit misleading.

For #48703
For #80172

Change-Id: I87f672275df189366b88cf3ffac8b3d21b7a1a83
Reviewed-on: https://go-review.googlesource.com/c/go/+/798500
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
2 files changed
tree: 9adfa753d194d26f7525137ad15438bdba0e943e
  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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