| commit | 569c901fef02a3779885f07dc74c47090d141623 | [log] [tgz] |
|---|---|---|
| author | Paul Berry <paulberry@google.com> | Tue Apr 08 13:56:14 2025 -0700 |
| committer | Commit Queue <dart-scoped@luci-project-accounts.iam.gserviceaccount.com> | Tue Apr 08 13:56:14 2025 -0700 |
| tree | ff7d802030f72e9500936a3cb3a436c4bee7af34 | |
| parent | a9313bf9ad058a17d138d9b92c11dfed0c7b51ee [diff] |
[sound flow analysis] Implement behaviors for equality comparisons. This change updates the flow analysis logic for `==` and `!=` expressions, `==` and `!=` patterns, and constant patterns, so that when the language feature `sound-flow-analysis` is enabled, the static types of the two expressions being compared are checked for nullability. If one of the types is non-nullable and the other type is `Null`, then it is known that the values will be unequal. Note that these new behaviors break assumptions made by several pre-existing flow analysis tests. I was able to adjust some of the tests to preserve their old behavior, either by adjusting expectations or running the test with `sound-flow-analysis` disabled. Some other tests became redundant, so I removed them. There is no behavioral change if the feature `sound-flow-analysis` is disabled. Bug: https://github.com/dart-lang/sdk/issues/60438 Change-Id: Ib65477e064bb8dcd761542ebe187843fe265a24b Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/420463 Commit-Queue: Paul Berry <paulberry@google.com> Reviewed-by: Chloe Stefantsova <cstefantsova@google.com>
Dart is:
Approachable: Develop with a strongly typed programming language that is consistent, concise, and offers modern language features like null safety and patterns.
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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.
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See LICENSE and PATENT_GRANT.
Visit dart.dev to learn more about the language, tools, and to find codelabs.
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