// @dart = 2.9
import "package:expect/expect.dart";

abstract class I<H, C, K> extends J<C, K> {}

abstract class J<Aa, B> {}

class A<N, S, U> {
  A(N n, S s) : field = <U>[] {}
  A.empty() : field = null {}
  List<U> get getter {}
  const A.c(U u, S s) : field = const [null];
  factory A.f(S s) {}
  final List<U> field;
  void set setter(S s) {}
}

main() {}