Re: [stack] What does "concatenative" actually mean?

John Nowak scripsit:

> The only possible alternative I can think of is to reference count  
> everything and error if attempting to use the world value when it has  
> more than one reference to it. Unfortunately, this approach is  
> unsatisfactory in a number of ways that I could elaborate on if anyone  
> is interested.

Hmm.  Joy doesn't do that: it just only lets you have pointers to the
world, and you can copy them all you want, but there is only one world.
(Actually, there is one world per open file, so funky interactions between
files are still possible, as well as the case of reading in a list
and then executing it.)

-- 
Evolutionary psychology is the theory           John Cowan
that men are nothing but horn-dogs,             http://www.ccil.org/~cowan
and that women only want them for their money.  [email protected]
        --Susan McCarthy (adapted)