using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace IEnumerableTest
{
    class Program
    {
        static void Main(string[] args)
        {

            Test.Normaltest(new Base());
            Test.IEnumerableTest(new Base[] { });

            Test.Normaltest(new Inheritance());
            Test.IEnumerableTest(new Inheritance[] { });

            Test.IEnumerableTest((IEnumerable<Inheritance>)new Inheritance[] { });

        }
    }


    public static class Test
    {
        public static void Normaltest(Base obj) { }
        public static void IEnumerableTest(IEnumerable<Base> obj) { }

    }
    

    public class Base
    {

    }

    public class Inheritance : Base
    {

    }



}