Language/Classes/Superinterfaces/implicit_interface_t03.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 a compile error if the implicit interface of a class
/// C includes an instance member m of type F and C declares or inherits a
/// corresponding instance member m of type F' if F' is not a subtype of F.
/// @description Checks that it is a compile error if the type F'
/// of declared instance member m is not a subtype of F. Test type aliases
/// @author ilya

abstract class I {
  foo(var x);
}

typedef IAlias = I;

class C implements IAlias {
  foo() {}
//^
// [analyzer] unspecified
// [cfe] unspecified
}

main () {
  new C();
}