class A {
  foo() {}
  int get bar => 42;
  void call() {}
  void set baz(int value) {}
}

class B {
  String toString([int extra = 42]) => super.toString();
}

error(String? s, A? a, B? b) {}

main() {}

ok<T extends Object?>(String? s, A? a, T t, B? b, Invocation i) {}