namespace System.Runtime.Serialization
{
    [CLSCompliant(false)]
    [Obsolete("BinaryFormatter serialization is obsolete and should not be used. See https://aka.ms/binaryformatter for more information.", DiagnosticId = "SYSLIB0011", UrlFormat = "https://aka.ms/dotnet-warnings/{0}")]
    public abstract class Formatter : IFormatter
    {
        protected abstract void WriteObjectRef(object? obj, string! name, Type! memberType);
    }
}