commit | 474edbe27f891acf1090f4c5c32b3bcbf94892cb | [log] [tgz] |
---|---|---|
author | Paul Berry <paulberry@google.com> | Thu Dec 17 19:31:34 2020 +0000 |
committer | commit-bot@chromium.org <commit-bot@chromium.org> | Thu Dec 17 19:31:34 2020 +0000 |
tree | cc40bbf2e11b65fd5d1abc6f5c8ef5c3bffc9836 | |
parent | e2107230e4343f5fd2e241bcd736fc99fce6eff3 [diff] |
Flow analysis: do not treat null vars as equivalent to `null`. When analyzing code like this with the `allowLocalBooleanVarsToPromote` flag enabled, don't treat a variable containing `null` as equivalent to a literal `null`. For example: f(int? x) { var y = null; if (x != y) { print(x + 1); // ERROR: x must be null checked. } } The rationale is that flow analysis doesn't promote variables that are known to be `null` to the `Null` type, so it seems like it would be inconsistent if we used the fact that they're `null` to promote other variables. Bug: https://github.com/dart-lang/language/issues/1274 Change-Id: Icfa14104936a26732353921e3a29a840c53d4d52 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/176560 Reviewed-by: Konstantin Shcheglov <scheglov@google.com> Commit-Queue: Paul Berry <paulberry@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, getting started, and more.
Browse pub.dev for more packages and libraries contributed by the community and the Dart team.
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.