Improve the development and runtime experience for Flutter.

Improve the speed and stability of Dart Analyzer, especially as it relates to dev_compiler.

Work to finalize two language tweaks

Initializing formals: https://github.com/dart-lang/sdk/issues/26655



Allow trailing commas: https://github.com/dart-lang/sdk/issues/26644

Dart 1.18 is now available. Go get it! The team has been focused on implementation details over the last six weeks. The API changes to the SDK are very light – see the CHANGELOG – but we have been working hard laying the foundation for a number of important projects. Download the latest release. Let us know what you think!