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Alexander Markov c96f1928f6 Revert "[vm/nnbd] Enable type testing stubs in NNBD weak mode" 
This reverts commit bffc9d101e.

Reason for revert: timeouts in internal builds (b/149301517).

Original change's description:
> [vm/nnbd] Enable type testing stubs in NNBD weak mode
> 
> According to the current NNBD spec we should use legacy subtyping rules
> when running in weak mode (disregarding nullability and accepting 'null'
> in type casts). So we can reuse exactly the same type testing stubs as
> we used before (in NNBD weak mode).
> 
> Change-Id: I387660fc2c8b36eb993239de9e34cc2bf9f7bb93
> Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/135381
> Commit-Queue: Alexander Markov <alexmarkov@google.com>
> Reviewed-by: Régis Crelier <regis@google.com>

TBR=alexmarkov@google.com,regis@google.com

Change-Id: I60c2aa74d35c42b6d6149ad3ddec59361c3de41f
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/135481
Reviewed-by: Alexander Markov <alexmarkov@google.com>
Commit-Queue: Alexander Markov <alexmarkov@google.com>
2020-02-12 18:53:01 +00:00
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README.md

Dart

A client-optimized language for fast apps on any platform

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 platforms illustration

License & patents

Dart is free and open source.

See LICENSE and PATENT_GRANT.

Using Dart

Visit the 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.

Building Dart

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.

Contributing to Dart

The easiest way to contribute to Dart is to file issues.

You can also contribute patches, as described in Contributing.