#nullable enable

public class Options {

}

​

public interface IStrategy<T> {

}

​

public interface IManager<T> {

    public T Strategy { get; set; }

}

​

public class ManagerWarning<T> : IManager<T> where T : IStrategy<Options>

{

    public T? Strategy { get; set; }

}

public class ManagerNoWarning<T> : IManager<T?> where T : IStrategy<Options>

{

    public T? Strategy { get; set; }

}

​

public class Program

{

    public static void Main()

    {

    }

}

#nullable disable