Language/Classes/Instance_Methods/override_subtype_t12.dart

// Copyright (c) 2019, the Dart project authors.  Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.

/// @assertion It is no static warning if an instance method m1 overrides an
/// instance member m2 and the type of m1 is not a subtype of the type of m2.
/// @description Checks that there are no warnings when type of m1 is in fact
/// a subtype of type of m2. Checks instance methods with optional parameters.
/// @author sgrekhov@unipro.ru

class Whatever {}
class Super {}
class Sub extends Super {}

class A {
  num? f1(Super x, Sub y, [Super? a]) {}
  int? f2(Super x, Sub y, [Sub? a]) {}
  dynamic f3(Super x, {Sub? a}) {}
}
typedef AAlias = A;

class C extends AAlias {
  int? f1(Super x, [Super? a, Super? b]) {}
  int? f2(Super x, [Sub? a, Super? b, Whatever? c]) {}
  int? f3(Super x, {Super? a, Super? b}) {}
}

main() {
  new A();
  new C();
}