LanguageFeatures/nnbd/nullability_definitions_A01_t06.dart

// 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 nullable if Null <: T and not T <: Object.
/// This is equivalent to the syntactic criterion that T is any of:
///  Null
///  S? for some S
///  S* for some S where S is nullable
///  FutureOr<S> for some S where S is nullable
///  dynamic
///  void
///
/// @description Check that null can be assigned to nullable type. Test
/// FutureOr<S> for some S where S is nullable
/// @author sgrekhov@unipro.ru

// Requirements=nnbd-strong
import "dart:async";

class C {}

main() {
  FutureOr<C?> fo1  = null;
  FutureOr<int?> fo2  = null;
  FutureOr fo3  = null;
  FutureOr<void> fo4  = null;
  FutureOr<Null> fo5  = null;
}