File: System\Runtime\CompilerServices\IUnknownConstantAttribute.cs
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Project: src\src\libraries\System.Runtime.InteropServices\src\System.Runtime.InteropServices.csproj (System.Runtime.InteropServices)
// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using System.Runtime.InteropServices;
 
namespace System.Runtime.CompilerServices
{
    [AttributeUsage(AttributeTargets.Field | AttributeTargets.Parameter, Inherited = false)]
    public sealed partial class IUnknownConstantAttribute : CustomConstantAttribute
    {
        public IUnknownConstantAttribute() { }
 
        public override object Value => new UnknownWrapper(null);
    }
}