Revert "Check void usage and invalid returns"

This reverts commit 11001793a2ab7a3ccc2b15c54dd61a14576cac16.

Reason for revert: Doesn't allow void to void assignment. This is breaks a lot of packages.

Original change's description:
> Check void usage and invalid returns
>
> Closes https://github.com/dart-lang/sdk/issues/30470
>
> Change-Id: I2ed5b54c74e0bba2771036774bbe2197ce29109d
> Reviewed-on: https://dart-review.googlesource.com/65141
> Commit-Queue: Peter von der Ahé <ahe@google.com>
> Reviewed-by: Dmitry Stefantsov <dmitryas@google.com>

TBR=ahe@google.com,dmitryas@google.com

Change-Id: I78f479cf8b0824dd338ae43a5514f320fd112a3f
Reviewed-on: https://dart-review.googlesource.com/66040
Reviewed-by: Leaf Petersen <leafp@google.com>
Reviewed-by: Mike Fairhurst <mfairhurst@google.com>
Commit-Queue: Mike Fairhurst <mfairhurst@google.com>
57 files changed
tree: d55e8ce4ac2bb4fc97e5927350fda23b09dcdeb7
  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. foo
  28. LICENSE
  29. PATENTS
  30. PRESUBMIT.py
  31. README.dart-sdk
  32. README.md
  33. WATCHLISTS
README.md

Dart

Dart is an open-source, scalable programming language, with robust libraries and runtimes, for building web, server, and mobile apps.

Using Dart

Visit the dartlang.org to learn more about the language, tools, getting started, and more.

Browse pub.dartlang.org for more packages and libraries contributed by the community and the Dart team.

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If you want to build Dart yourself, here is a guide to getting the source, preparing your machine to build the SDK, and building.

There are more documents on our wiki.

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You can also contribute patches, as described in Contributing.

License & patents

See LICENSE and PATENTS.