[macros] Don't search for package config in macro namespace. If search for package config fails, the resolved package config was being represented as null causing the macro build to go looking for it again and fail with a confusing error. Instead, use empty Uri to represent failed search for package config. The doc comment for the package config Uri says empty Uri means "no package config", but that doesn't actually work; make it work. The macro compile will still fail because it needs a package config to find the macro deps. R=johnniwinther@google.com Change-Id: I3a0e3e4a976782f2f5e326537c7e0e6415d5fecf Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/356082 Auto-Submit: Morgan :) <davidmorgan@google.com> Commit-Queue: Morgan :) <davidmorgan@google.com> Reviewed-by: Jens Johansen <jensj@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.
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 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.
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You can also contribute patches, as described in Contributing.