library test;
import self as self;
import "dart:async" as asy;
import "dart:core" as core;

import "dart:async";

static method main() → dynamic async {
  () →* asy::Stream<Null>* f = () → asy::Stream<Null>* async* {
    yield null;
  };
  asy::Stream<dynamic>* y = f(){() →* asy::Stream<Null>*};
  asy::Stream<core::String*>* z = f(){() →* asy::Stream<Null>*};
  core::String* s = await f(){() →* asy::Stream<Null>*}.{asy::Stream::first}{asy::Future<Null>*};
}