Extends the type checking of async functions to check whether the
declared return type of an async function is a super type of Future<T>
for any T.  In case the check is not successful an error message is
produced. The location of the name of the offending function
declaration is used as location information for message. Ideally we
would use the location of the type, so until types get annotated with
location information the error message remains suboptimal.

This closes #33425 and closes #34057.

Thanks to dmitryas and jensj for their helpful guidance.

Bug: dartbug.com/33425 dartbug.com/34057
Change-Id: I3b3dadc25b574422ea1f38671fe8cba3ffdd494c
Reviewed-on: https://dart-review.googlesource.com/69307
Commit-Queue: Daniel Hillerström <hillerstrom@google.com>
Reviewed-by: Dmitry Stefantsov <dmitryas@google.com>
10 files changed
tree: f70f5f4d864d4f9b87aece7a4b1e9c61f1161f52
  1. .github/
  2. build/
  3. client/
  4. docs/
  5. pkg/
  6. runtime/
  7. samples/
  8. samples-dev/
  9. sdk/
  10. tests/
  11. third_party/
  12. tools/
  13. utils/
  14. .clang-format
  15. .gitattributes
  16. .gitconfig
  17. .gitignore
  18. .gn
  19. .mailmap
  20. .packages
  21. AUTHORS
  22. BUILD.gn
  23. CHANGELOG.md
  24. codereview.settings
  25. dartdoc_options.yaml
  26. DEPS
  27. LICENSE
  28. PATENTS
  29. PRESUBMIT.py
  30. README.dart-sdk
  31. README.md
  32. WATCHLISTS
README.md

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