Dart language support async/await programming style, or similar?

This question already has an answer here:

Async/Await feature in Dart 1.8 1 answer

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Not for now. See issue Support for "await" in Dart.

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Basic support is already available.
See https://www.dartlang.org/articles/await-async/ for more details.

main() async {
  print(await foo());
  try {
    print(await fooThrows());
  } catch(e) {
    print(e);
  }
}

foo() async => 42;

fooThrows() async => throw 'Anything';

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