Language/Classes/Abstract_Instance_Members/override_not_a_subtype_t04.dart

// Copyright (c) 2011, 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 Unless explicitly stated otherwise, all ordinary rules that apply
/// to methods apply to abstract methods.
/// It is a compile error 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 a compile error is produced when the type of a
/// non-abstract m1 is not a subtype of the abstract m2's type because their
/// respective required parameter types are not mutually assignable even if the
/// class declaring the first method is not a direct subclass of the other.
/// @author rodionov


abstract class A {
  foo(int x);
}

abstract class B extends A {
}

class C extends B {
  foo(String x) {}
//           ^
// [analyzer] unspecified
// [cfe] unspecified
}

main() {
  new C().foo("1");
}