go/types: delay expansion of underlying in typeDecl

Even after type-checking the RHS of a type declaration, we may not yet
be able to expand, if the RHS is itself an instance (see #49043).

We can instead rely on the mechanisms we have in place for delayed
expansion.

Fixes #49043

Change-Id: Ibffa4c1b1163c824b5c7e151aaac35f3e8c84ec7
Reviewed-on: https://go-review.googlesource.com/c/go/+/356533
Trust: Robert Findley <rfindley@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
Reviewed-by: Robert Griesemer <gri@golang.org>
4 files changed
tree: dae71d7d8ac104de718f7c6d0fc1a9962e8dae62
  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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