Csharp warning CS0168: The variable 'NeverUsed' is declared but never used

using System;
namespace HelloClass
{
    class HelloWorld
    {
        public static void Main()
        {
                
            int NeverUsed;
            Console.WriteLine("Hello World!");
        }
    }
}

Produces

Microsoft (R) Visual C# .NET Compiler version 7.10.6001.4
for Microsoft (R) .NET Framework version 1.1.4322
Copyright (C) Microsoft Corporation 2001-2002. All rights reserved.

helloError3.cs(9,17): warning CS0168: The variable 'NeverUsed' is declared but never used

This is only a warning the csc compiler will still compile the program.