// @dart = 2.12
import 'opt_out_lib.dart';

class A<T> {
  late int field = 42;
}

class B extends A<String?> {}

typedef F = void Function()?;
List<String?> l = [];
String? s = null;
var t = s!;
late int field = 42;
void method(void f()?, {required int a}) {}
main() {}
noErrors() {}