src/mscorlib/shared/System/Runtime/CompilerServices/ExtensionAttribute.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.

using System;

namespace System.Runtime.CompilerServices
{
    /// <summary>
    /// Indicates that a method is an extension method, or that a class or assembly contains extension methods.
    /// </summary>
    [AttributeUsage(AttributeTargets.Method | AttributeTargets.Class | AttributeTargets.Assembly)]
    public sealed class ExtensionAttribute : Attribute { }
}