Elements. Infer type arguments for redirected generic factory constructors.

Fix element model building to infer type arguments for redirected
factory constructors of generic classes (both named and unnamed). This
brings element construction in line with AST resolution so redirected
targets carry the correct type substitutions instead of defaulting to
uninstantiated or incorrect types.

What changed:
- Perform generic inference when resolving the redirect target type in
  `NamedTypeResolver`, using the enclosing class as context.
- Replace the brittle `redirectedConstructor_namedType` tracking with
  structural detection of redirecting constructor contexts.
- Ensure `ResolutionVisitor` provides the enclosing class to the type
  resolver and visit the redirection directly.
- Adjust `AstResolver` ordering so enclosing declaration info is set
  before resolving constructor children.
- Bump `DATA_VERSION` to invalidate stale serialized data.

Why:
- Previously, only AST resolution performed inference. Element model
  building skipped it, producing incorrect constructor redirections in
  summaries and downstream analyses. Aligning both paths fixes those
  inconsistencies.

Impact:
- Correct substitutions are recorded for redirected constructors in
  summaries; no public API changes expected.
- Adds targeted tests to prevent regressions (no behavioral changes
  beyond the intended inference fix).

Fixes: flutter/flutter#174503

Bug: https://github.com/flutter/flutter/issues/174503
Change-Id: If231de40de9af15ec14dc26cda28bdc269d9896e
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/447603
Commit-Queue: Konstantin Shcheglov <scheglov@google.com>
Reviewed-by: Paul Berry <paulberry@google.com>
5 files changed
tree: c6cd396d444b03e91b118d498ad929a953597be8
  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. pubspec.yaml
  32. README.dart-sdk
  33. README.md
  34. sdk.code-workspace
  35. sdk_args.gni
  36. sdk_packages.yaml
  37. SECURITY.md
  38. 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 in our repo at docs.

Contributing to Dart

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

You can also contribute patches, as described in Contributing.

Roadmap

Future plans for Dart are included in the combined Dart and Flutter roadmap on the Flutter wiki.