using System;

    using System.Collections.Generic;

    using System.Diagnostics;

    using System.Linq;

public class Program

{

    public class A : IDisposable

    {

        public A(){}

        public void Dispose()

        {

            Console.WriteLine("dispose");

        }

    }

    public static void Main()

    {

        if(true)

        {

            using var a = new A();

            using var b = new A();

            Console.WriteLine("if end");

        }

        Console.WriteLine("main end");

    }

}