Restore mixed-mode language tests.

This change reverts https://dart-review.googlesource.com/c/sdk/+/341020.

The reverted CL removed tests from `tests/language` that contained
legacy code (code with a language version less than 2.12). The primary
purpose of the removal was to unblock removal of legacy support from
the analyzer. It seemed safe to do because legacy code isn't supported
anymore, and no legacy code exists in google3 anymore. However,
several of those tests exercised important "weak mode" runtime
semantics of the web and VM platforms. See discussion at
https://dart-review.googlesource.com/c/sdk/+/341020/comments/bce31aa1_f5392ce1
for details.

This CL restores the deleted tests. Fortunately, since all the
restored tests are annotated with `Requirements=nnbd-weak`, they will
be skipped on the analyzer (thanks to
https://dart-review.googlesource.com/c/sdk/+/342080), so restoring
them no longer gets in the way of removing legacy support from the
analyzer.

Change-Id: Ib828be76f5c7eaeecaad0b7e7f7b0e3ff2f4bdb2
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/342090
Reviewed-by: Sigmund Cherem <sigmund@google.com>
Commit-Queue: Paul Berry <paulberry@google.com>
205 files changed
tree: 5d8e570f73a088ebd08d760b262d62c6648f708f
  1. .dart_tool/
  2. .github/
  3. benchmarks/
  4. build/
  5. docs/
  6. pkg/
  7. runtime/
  8. samples/
  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. .style.yapf
  21. AUTHORS
  22. BUILD.gn
  23. CHANGELOG.md
  24. codereview.settings
  25. CONTRIBUTING.md
  26. DEPS
  27. LICENSE
  28. OWNERS
  29. PATENT_GRANT
  30. PRESUBMIT.py
  31. README.dart-sdk
  32. README.md
  33. sdk.code-workspace
  34. sdk_args.gni
  35. SECURITY.md
  36. WATCHLISTS
README.md

Dart

An approachable, portable, and productive language for high-quality apps on any platform

Dart is:

  • Approachable: Develop with a strongly typed programming language that is consistent, concise, and offers modern language features like null safety and patterns.

  • Portable: Compile to ARM, x64, or RISC-V machine code for mobile, desktop, and backend. Compile to JavaScript or WebAssembly for the web.

  • Productive: Make changes iteratively: use hot reload to see the result instantly in your running app. Diagnose app issues using DevTools.

Dart's flexible compiler technology lets you run Dart code in different ways, depending on your target platform and goals:

  • Dart Native: For programs targeting devices (mobile, desktop, server, and more), Dart Native includes both a Dart VM with JIT (just-in-time) compilation and an AOT (ahead-of-time) compiler for producing machine code.

  • Dart Web: For programs targeting the web, Dart Web includes both a development time compiler (dartdevc) and a production time compiler (dart2js).

Dart platforms illustration

License & patents

Dart is free and open source.

See LICENSE and PATENT_GRANT.

Using Dart

Visit dart.dev to learn more about the language, tools, and to find codelabs.

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

Our API reference documentation is published at api.dart.dev, based on the stable release. (We also publish docs from our beta and dev channels, as well as from the primary development branch).

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.