// 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 We say that a type T is non-nullable if T <: Object. This is
/// equivalent to the syntactic criterion that T is any of:
///  Never
///  Any function type (including Function)
///  Any interface type except Null.
///  S* for some S where S is non-nullable
///  FutureOr<S> where S is non-nullable
///  X extends S where S is non-nullable
///  X & S where S is non-nullable
///
/// @description Check that type which is not subtype of Object cannot be
/// assigned to non-nullable type. Test X extends S where S is non-nullable. Test
/// type aliases
/// @author sgrekhov@unipro.ru

class S {}

typedef SAlias = S;

class C<X extends SAlias> {
  test(X t) {
    t = null;
//      ^^^^
// [analyzer] unspecified
// [cfe] unspecified
  }
}

main() {
  C<S>().test(new S());
}