Public and private visibility in Self

[baltasarq]

Hi !

I've always wondered why the public and private visibility is just 
notational in Self. I think there was something preventing the 
visibility mechanism to working in Self, but can't remember exactly 
what it was.

Is there any problem preventing a prototype language to implement 
private visibility ? If there is something ... can you post an example ?

Thank you !

Baltasar