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… safety semantics

 - Some tests were using a 'main' with a signature that does not match
   the new spec,changed these tests to invoke 'testMain' instead of
 - deleted test case for a factory method that returns a null (reports
   as a compilation error now)
 - Fixed some of the isolate_reload tests to not crash
 - Turn on non-nullable experiment flag by default for unit tests
 - Added a unit test for creation of a non nullable list of strings using the Dart C API.

Change-Id: I2c345aaabdc29e9222c1d451f2ef43ba5cdb3686
Commit-Queue: Siva Annamalai <>
Reviewed-by: Ben Konyi <>


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Oct 22, 2020


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.


Using Dart

Visit to learn more about the language, tools, getting started, and more.

Browse 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.

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