#nullable enable

​

using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

        try

        {

            Test(1);

            Test("asdf");

            string test = null!;

            Test(test);

        }

        catch (Exception e)

        {

            Console.WriteLine(e);

        }

    }

    private static void Test<T>(T value)

    {

        // == works as well

        if (value is null)

        {

            throw new ArgumentNullException(nameof(value));

        }

    }

}