main.dart

import 'dart:async';

Stream<int> stream() async* {
  int k = 0;
  while (k < 10) yield k++;
}

void main() async {
  await for(int i in stream()) {
    print('Starting $i ...');
    await new Future.delayed(new Duration(seconds: 2));
    print('Finishing $i ...');
  }
}