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


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// Copyright (c) Microsoft. All rights reserved.
// Licensed under the MIT license. See LICENSE file in the project root for full license 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 { }
}