LanguageFeatures/nnbd/extension_method_resolution_A01_t05.dart

// Copyright (c) 2020, 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 For the purposes of extension method resolution, there is no
/// special treatment of nullable types with respect to what members are
/// considered accessible. That is, the only members of a nullable type that are
/// considered accessible (and hence which take precedence over extensions) are
/// the members on Object.
///
/// @description Check that extension method resolution is applicable to the
/// nullable type. Test type alias for A?
/// @author sgrekhov@unipro.ru
/// @issue 41349

// Requirements=nnbd-strong

import '../../Utils/expect.dart';

typedef IntAlias = int?;

extension on IntAlias {
  bool get isEven => this?.isEven ?? true;
}

void main() {
  IntAlias i = null;
  Expect.isTrue(i.isEven);
}