reactive/Ix.NET/Source/System.Interactive.Async/TaskExt.cs

// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the Apache 2.0 License.
// See the LICENSE file in the project root for more information. 

namespace System.Threading.Tasks
{
    static class TaskExt
    {
        public static readonly Task<bool> True = Task.FromResult(true);
        public static readonly Task<bool> False = Task.FromResult(false);
        public static readonly Task CompletedTask = True;
    }
}