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Sun Oct 14 16:52:21 CEST 2007

new ideas from doc

It looks like things are getting cleaner: by taking this partial
evaluation thing serious, CAT primitives can be largely
eliminated. Just the words >m and m>, together with some stack
juggling words like m-swap, are enough to implement the whole
language. I just need to clean up a bit more so this idea can be
sealed as a property: no primitives except for a stack!

For documentation purposes it might now even be a good idea to write
most code in compiler.ss and pic18-compiler.ss in Purrr syntax,
leaving only the true primitives in s-expr syntax.  EDIT: that's a bad
idea until the forth syntax can represent everything the s-expr syntax
can.

The remaining cleanup brings me to the backtracking for/next
implementation. With just quoted macros and a 'compile' that executes
macros, this can be removed from the primitives.

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