gistfile1.txt

void main() {
  final test = new Test();
  for (var func in doEverything()) {
    func(test);
  }
  assert(test.foo == 'bar');
}
class Test {
  String foo;
}


typedef void VoidFunction(Test test);

Iterable<VoidFunction> doEverything() sync* {
  yield (Test test) {test.foo = 'bar';};
}