Sat Aug 15 13:55:38 CEST 2009

EX: expression language

`expressions' use the following resources:
              - GC
              - exceptions
              - leaf types

It is a dynamically typed functional language using the C-stack for
expression nesting.

The Scheme and PF languages add primitives that operate on an
extension of this state, with most of the primitive expressions

Now, by binding EX in the respective scripting languages to &pf->m and
&sc->m it is possible to abbreviate all expressions, leaving out the
prefixes.  I.e. generalization of:

#define CONS(a,b)  ex_cons(EX, a, b)

Now that the infrastructure is there, let's move the primitives lazily
depending on need in both languages.