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// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
#if !NO_PERF
using System;
using System.Reactive.Disposables;
namespace System.Reactive.Linq.ObservableImpl
{
class Never<TResult> : IObservable<TResult>
{
public IDisposable Subscribe(IObserver<TResult> observer)
{
if (observer == null)
throw new ArgumentNullException("observer");
return Disposable.Empty;
}
}
}
#endif
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