Test an odd interaction of implicit `.call` tearoffs with promotion.

Currently, we decide whether to insert an implicit `.call` tearoff on
an expression based on the type the expression is being assigned to,
whereas the spec says that we decide it based on the context type.

In most cases, these are the same type, however when assigning to a
promoted variable, the context type is the promoted type, whereas the
"type being assigned to" is the unpromoted type.

Previously, we had no language tests of this behavior; it just emerged
naturally from the way it was implemented in the CFE.  This test locks
down the behavior so that we won't change it by mistake.

We may, at some future time, decide to change it on purpose though.
Discussion about this behavior is ongoing on the langauge team.

Change-Id: I82f54c8875fd3b5829c5f75a676fdaf5eea64703
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/233650
Reviewed-by: Lasse Nielsen <lrn@google.com>
Commit-Queue: Paul Berry <paulberry@google.com>
2 files changed
tree: e184e6d21b2df982fd23fbbd56858f20b7bee50c
  1. .dart_tool/
  2. .github/
  3. benchmarks/
  4. build/
  5. docs/
  6. pkg/
  7. runtime/
  8. samples/
  9. samples-dev/
  10. samples_2/
  11. sdk/
  12. tests/
  13. third_party/
  14. tools/
  15. utils/
  16. .clang-format
  17. .gitattributes
  18. .gitconfig
  19. .gitignore
  20. .gn
  21. .mailmap
  22. .packages
  23. .style.yapf
  24. .vpython
  26. BUILD.gn
  27. CHANGELOG.md
  28. codereview.settings
  29. compile_output.txt
  31. DEPS
  33. OWNERS
  35. PRESUBMIT.py
  36. README.dart-sdk
  37. README.md
  38. sdk_args.gni
  39. SECURITY.md


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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Using Dart

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