/*
 * 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 In a migrated library, override checking must check that an
 * override is consistent with all overridden methods from other migrated
 * libraries in the super-interface chain, since a legacy library is permitted
 * to override otherwise incompatible signatures for a method.
 *
 * @description Check that if generic opted-in class is a mixin  generic legacy
 * class with [FutureOr<nullable_type>] type parameter, child opted-in class
 * type parameter can extend nullable type.
 *
 * @Issue 39666
 *
 * @author iarkh@unipro.ru
 */
// SharedOptions=--enable-experiment=non-nullable
// Requirements=nnbd-strong
import "dart:async";
import "../../Utils/expect.dart";
import "override_checking_legacy_futureor_lib.dart";

class OptedFutureOr<T extends FutureOr> with LEGACY_CLASS_FUTUREOR<T> {
  dynamic getParamType() => T;
}

class OptedFutureOrInt<T extends FutureOr<int>?> with LEGACY_CLASS_FUTUREORINT<T> {
  dynamic getParamType() => T;
}

class OptedFutureOrFunction<T extends FutureOr<Function>?> with LEGACY_CLASS_FUTUREORFUNCTION<T> {
  dynamic getParamType() => T;
}

class OptedFutureOrFutureOr<T extends FutureOr<FutureOr>?> with LEGACY_CLASS_FUTUREORFUTUREOR<T> {
  dynamic getParamType() => T;
}

main() {
  Expect.equals(typeOf<FutureOr<dynamic>>(), OptedFutureOr().getParamType());
  Expect.equals(typeOf<FutureOr<dynamic>>(), OptedFutureOr<FutureOr>().getParamType());
  Expect.equals(typeOf<FutureOr<dynamic>>(), OptedFutureOr<FutureOr?>().getParamType());

  Expect.equals(typeOf<FutureOr<int>?>(), OptedFutureOrInt().getParamType());
  Expect.equals(typeOf<FutureOr<int>?>(), OptedFutureOrInt<FutureOr<int>?>().getParamType());

  Expect.equals(typeOf<FutureOr<Function>?>(), OptedFutureOrFunction().getParamType());
  Expect.equals(typeOf<FutureOr<Function>?>(), OptedFutureOrFunction<FutureOr<Function>?>().getParamType());

  Expect.equals(typeOf<FutureOr<FutureOr>>(), OptedFutureOrFutureOr().getParamType());
  Expect.equals(typeOf<FutureOr<FutureOr>>(), OptedFutureOrFutureOr<FutureOr<FutureOr>>().getParamType());
  Expect.equals(typeOf<FutureOr<FutureOr>>(), OptedFutureOrFutureOr<FutureOr<FutureOr>?>().getParamType());
}