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

static method returnFutureOfVoid() → asy::Future<void>* async {}
static method returnVoid() → void {}
static method returnVoidAsync() → void async {}
static method main() → dynamic async {
  await self::returnVoid();
  await self::returnFutureOfVoid();
  await self::returnVoidAsync();
}