namespace System.Runtime.InteropServices.Marshalling
{
    [CustomMarshaller(typeof(object), MarshalMode.Default, typeof(ComVariantMarshaller))]
    [CustomMarshaller(typeof(object), MarshalMode.UnmanagedToManagedRef, typeof(RefPropagate))]
    public static class ComVariantMarshaller
    {
        public struct RefPropagate
        {
            public void Free();
        }
    }
}