[stable][dart2js] Fix late local lowering with record destructuring. The CFE's lowering for record patterns can sometimes make use of late local fields. Dart2JS's late lowerer assumes that all late local fields live in the scope of some function body. Record patterns allow late locals to be created in other contexts though. Some examples that break this assumption include field initializers and expressions in constructor initializer lists. To fix this we add a late local scope in some extra contexts where these record patterns can show up. Fixes: 53358 Bug: https://github.com/dart-lang/sdk/issues/53358 Change-Id: Ic730f41253782241b3394c0b0353d1731e122c85 Cherry-pick: https://dart-review.googlesource.com/c/sdk/+/323020 Cherry-pick-request: https://github.com/dart-lang/sdk/issues/53449 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/324600 Reviewed-by: Sigmund Cherem <sigmund@google.com> Commit-Queue: Nate Biggs <natebiggs@google.com>
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 is free and open source.
See LICENSE and PATENT_GRANT.
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).
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.
The easiest way to contribute to Dart is to file issues.
You can also contribute patches, as described in Contributing.