Sat Aug 15 16:05:08 CEST 2009

PF / PX primitives

In light of this sharing it makes sense to define PF in terms of PX
primitives: in-place expressions.

pf_  forth words
pl_  linear (in-place update) expressions

ex_  nonlinear (sharing / consing) expressions (usable in Scheme)

pf_  probably are redundant, and can be generated from px_