// 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 no optional
/// parameters. Test type aliases
/// @author sgrekhov@unipro.ru

class Super {}
class Sub extends Super {}

class A {
  num?     f1() {}
  Super?   f2() {}
  Super?   f3() {}
  Sub?     f4() {}

  int?     f5(Super x) {}
  Super?   f6(Super x) {}
  Super?   f7(Sub x) {}
  Sub?     f8(Super x) {}
}
typedef AAlias = A;

class C extends AAlias {
  int? f1() {}
  Super?   f2() {}
  Sub?     f3() {}
  Sub?   f4() {}

  int?     f5(dynamic x) {}
  Super?   f6(Super x) {}
  Super?   f7(Super x) {}
  Sub?     f8(Super x) {}
}

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