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

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