using System.Runtime.CompilerServices; namespace System.Reactive { [System.Runtime.CompilerServices.NullableContext(1)] [System.Runtime.CompilerServices.Nullable(0)] internal sealed class NopObserver<[System.Runtime.CompilerServices.Nullable(2)] T> : IObserver<T> { public static readonly IObserver<T> Instance = new NopObserver<T>(); public void OnCompleted() { } public void OnError(Exception error) { } public void OnNext(T value) { } } }