Access derived type in baseclass static function template

[Arafel via Digitalmars-d-learn]

> 
> What you are looking for is virtual static methods, and D doesn't have 
> those. I don't know if there's a way to make it work with existing 
> features.
> 

Well, there are interesting things to do:

https://dpaste.dzfl.pl/ed826ae21473

I don't know if that's what one would call "virtual static", but I'd say 
it comes close...