Thread bug 2.cs

using System.Threading;

namespace ConsoleApp
{
    class Program
    {
        static void Main(string[] args)
        {
            var t = new Thread(() => { });
            t.IsBackground = true;
            t.Start();
            t.Join(30000);

            t.IsBackground = false;
            //.NET:  System.Threading.ThreadStateException: Thread is dead; state cannot be accessed:
            // Mono:  no exception
        }
    }
}