[ddc] Fix async methods with Object return type

The sound null safety spec includes a change in the calculation of
static types of return values in async methods. The "Future value
type" should be `Object?` when the declared return type of the
async method is `Object`.

See https://github.com/dart-lang/language/blob/master/accepted/future-releases/nnbd/feature-specification.md#the-future-value-type-of-an-asynchronous-non-generator-function

With this change,
co19/LanguageFeatures/nnbd/future_value_type_A05_t01 is now passing
in sound mode.

Change-Id: Ia7d4cb2fd57c1d2e50dbf8e59658a70124b0c8b3
Fixes: https://github.com/dart-lang/sdk/issues/44745
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/181303
Commit-Queue: Nicholas Shahan <nshahan@google.com>
Reviewed-by: Sigmund Cherem <sigmund@google.com>
Reviewed-by: Mark Zhou <markzipan@google.com>
1 file changed
tree: 331d20c71b8ecc959e732b7ee6b6b820e62f7d65
  1. .dart_tool/
  2. .github/
  3. benchmarks/
  4. build/
  5. client/
  6. docs/
  7. pkg/
  8. runtime/
  9. samples/
  10. samples-dev/
  11. samples_2/
  12. sdk/
  13. tests/
  14. third_party/
  15. tools/
  16. utils/
  17. .clang-format
  18. .gitattributes
  19. .gitconfig
  20. .gitignore
  21. .gn
  22. .mailmap
  23. .packages
  24. .style.yapf
  25. .vpython
  26. AUTHORS
  27. BUILD.gn
  28. CHANGELOG.md
  29. codereview.settings
  30. CONTRIBUTING.md
  31. DEPS
  32. LICENSE
  33. PATENT_GRANT
  34. PRESUBMIT.py
  35. README.dart-sdk
  36. README.md
  37. sdk_args.gni
  38. WATCHLISTS
README.md

Dart

A client-optimized language for fast apps on any platform

Dart is:

  • Optimized for UI: Develop with a programming language specialized around the needs of user interface creation.

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

  • Fast on all platforms: Compile to ARM & x64 machine code for mobile, desktop, and backend. Or compile to JavaScript for the web.

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

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See LICENSE and PATENT_GRANT.

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There are more documents on our wiki.

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