using System;

public class Test
{
	class Base {
	}
	class Derived : Base {
		public string X {get;set;}
	}
	
	
	
	public static void Main()
	{
		Func<Derived,object> original = d => d.X;
		Func<Base,object> converted = b => original((Derived)b);
		Base obj = new Derived {X = "hello"};
		Console.WriteLine(converted(obj));
	}
}