Local functions and closures in C# 7

Program.cs

using System;

class Program
{
    static Func<int, int> CreateAdder(int a)
    {
        int F(int i)
        {            
            Console.WriteLine($"Closured {a}");
            return a + i;
        }
        return F;
    }
    
    static void Main(string[] args)
    {
        var add1 = CreateAdder(1);
        var d = add1(4);
        Console.WriteLine(d);
        var add2 = CreateAdder(2);
        d = add2(4);
        Console.WriteLine(d);
        Console.ReadLine();
    }
}