LanguageFeatures/nnbd/weak/type-normalization/equations_A11_t01.dart

/*
 * Copyright (c) 2021, 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 NORM relation defines the canonical representative of classes
 * of equivalent types...
 * This is based on the following equations:
 *   FutureOr<T> == T if Future<T> <: T
 *
 * @description Checks that if Future<T> <: T then FutureOr<T> == T
 *
 * @author sgrekhov@unipro.ru
 */
// Requirements=nnbd-weak
import 'dart:async';

class A<X> {}
class B<X> implements A<X> {}

class CO extends B<FutureOr<Object>> implements A<Object> {}
class CD extends B<FutureOr<dynamic>> implements A<dynamic> {}
class CV extends B<FutureOr<void>> implements A<void> {}

main() {
  new CO();
  new CD();
  new CV();
}