class A {
  A(int x, int y, {required int z});
  factory A.foo(int x, int y, {required int z}) => new A(x, y, z: z);
  void Function(int x, int y, {required int z}) get property => throw 42;
  void bar(int x, int y, {required int z}) {}
}

typedef B = A;
foo(int x, int y, {required int z}) {}

extension E on A {
  method1() {}
  method2(int bar, {int? foo}) {}
}

test(dynamic d, Function f, A a) {}

class Test extends A {
  Test() : super(1, 2, z: 3);
  test() {}
}

main() {}