final bool inSoundMode = <int?>[] is! List<int>;
main() {}

class Class1 {
  final int field;
  Class1._([this.field = 42]);
  factory Class1([int field]) = Class1._;
}

class Class2 {
  final int field;
  Class2._({this.field: 42});
  factory Class2({int field}) = Class2._;
}

void testDefaultValues() {}
expect(expected, actual) {}
throws(Function() f, {bool inSoundModeOnly: false}) {}