Async function of the Dart programming language is not working properly
Since Dart 2 sync code at the beginning of async functions is executed sync.
This was different in Dart 1.
A workaround would be
Future<bool> longWait(String prefix) async { await Future.microtask((){}); for (int i = 0; i < 5; i++) { print('$prefix $i'); } return true;}The code after the await is executed async and results in the desired behavior. (tested in DartPad)