Strange Dart 5

main.dart

class C {
  dynamic get a {
    print('C.a getter called');
    return (x) => print('C.a return value called');
  }
}

void main() {
  var x = C();

  // Argument evaluted before `x.a`
  x.a((() {
    print('Argument evaluated');
    return 1;
  })());

  print('---');

  // Argument evaluted after `x.a`
  (x.a)((() {
    print('Argument evaluated');
    return 1;
  })());
}