ExtensionMarkerAttribute
using Microsoft.CodeAnalysis;
namespace System.Runtime.CompilerServices
{
    [CompilerGenerated]
    [Microsoft.CodeAnalysis.Embedded]
    [AttributeUsage(AttributeTargets.Class | AttributeTargets.Struct | AttributeTargets.Enum | AttributeTargets.Method | AttributeTargets.Property | AttributeTargets.Field | AttributeTargets.Event | AttributeTargets.Interface | AttributeTargets.Delegate, AllowMultiple = false, Inherited = false)]
    internal sealed class ExtensionMarkerAttribute : Attribute
    {
        public ExtensionMarkerAttribute(string name)
        {
        }
    }
}