Reland "Add hints to check the SDK constraints for both set literals and for the ui-as-code features"

This is a reland of 5fdb3c505785457ab0f0c92155e296c570bbea7b

Original change's description:
> Add hints to check the SDK constraints for both set literals and for the ui-as-code features
> 
> Change-Id: I1046e57304d56e6d7f088ea1a8a054318a45ac37
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/96837
> Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>
> Reviewed-by: Konstantin Shcheglov <scheglov@google.com>

Change-Id: Ic2fd6d4ad82b6882e20373d224177ea8ebc4685b
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/97121
Reviewed-by: Konstantin Shcheglov <scheglov@google.com>
Reviewed-by: Paul Berry <paulberry@google.com>
Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>
11 files changed
tree: fcbd051d0fb4ad78b0fecec78d5b15c784ef525c
  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. .vpython
  22. AUTHORS
  23. BUILD.gn
  24. CHANGELOG.md
  25. codereview.settings
  26. CONTRIBUTING.md
  27. DEPS
  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.

Building Dart

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.

Contributing to Dart

The easiest way to contribute to Dart is to file issues.

You can also contribute patches, as described in Contributing.

License & patents

See LICENSE and PATENTS.