using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        dynamic h = new QH();

        Func<Q, int> d = h.Handle;

    }

}

interface IQuery<T> {}

interface IQueryHandler<TQuery, T>

    where TQuery : IQuery<T>

{

    T Handle(TQuery query);

}

class Q : IQuery<int> {}

class QH : IQueryHandler<Q, int>

{

    public int Handle(Q query)

    {

        return 5;

    }

}