Segmentation fault from using SList in a class?

[Tim K. via Digitalmars-d-learn]

On Saturday, 6 June 2015 at 10:10:15 UTC, Manfred Nowak wrote:
> x is not initialized.
>
> `auto x= new Stack!(int);'
> will do.

Thank you two.
But that leads me to another question: Why do I need to 
initialize x with a "new Stack" but I don't need to initialize p 
with a "new SList"?

Best regards,
Tim