src/mscorlib/shared/System/IObserver.cs


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

namespace System
{
    public interface IObserver<in T>
    {
        void OnNext(T value);
        void OnError(Exception error);
        void OnCompleted();
    }
}