Lasse R.H. Nielsen 16d806b0aa Make the spec specific about the return type of sync*/async/async* function. ... Now requires the type to be a supertype of `Iterable<T>`/`Future<T>`/`Stream<T>` for some `T`. This allows, say, all `Future<T>` return types for `async` but disallows using a different class implementing `Future`: ``` MyFuture foo() async {} ``` gives a static warning (error in Dart 2) because the return type is statically known to be unsatisfied. Fixes issue #27470 BUG= http://dartbugcom/27470 R=eernst@google.com, floitsch@google.com Review URL: https://codereview.chromium.org/2392513002 .		2016-10-05 10:24:10 +02:00
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language	Make the spec specific about the return type of sync*/async/async* function.	2016-10-05 10:24:10 +02:00