// 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 The grammar for types does not allow multiple successive ?
/// operators on a type. That is, the grammar for types is nominally equivalent
/// to:
///  type' ::= functionType
///  | qualified typeArguments?
///  type ::= type' `?`?
///
/// @description Check that the grammar for types does not allow multiple
/// successive ? operators on a type. Test type aliases
/// @author sgrekhov@unipro.ru

class A {}

typedef AAlias = A;

typedef AAlias2 = A??;
//                  ^
// [analyzer] unspecified
// [cfe] unspecified

class C<X extends AAlias??> {}
//                       ^
// [analyzer] unspecified
// [cfe] unspecified

test(AAlias?? a) {}
//          ^
// [analyzer] unspecified
// [cfe] unspecified


main() {
  AAlias?? a = null;
//       ^
// [analyzer] unspecified
// [cfe] unspecified
}