[StructLayout(LayoutKind.Explicit)]
    public struct AssemblyCache
    {
        [FieldOffset(0)]
        public object AssemblyLock;

        [FieldOffset(0)]
        public Assembly Assembly;
    }


    class Program
    {
        static void Main(string[] args)
        {
            var cache = new AssemblyCache { AssemblyLock = new object() };
            Console.WriteLine(cache.Assembly != null);

        }

    }