using System;
using System.Collections.Generic;

namespace RedundantCast
{
    class Program
    {
        class A { }
        class B : A { }

        B Foo() { return null; }

        static void Main()
        {
            (new Program()). Run();
        }

        void Run()
        {
            var list = new List<Func<A>>();
            list. Add((Func<B>) Foo);
            switch (list[0])
            {
                case Func<B> value: Console.WriteLine("B"); break;
                case Func<A> value: Console.WriteLine("A"); break;
            }
        }
    }
}