While we're on pretty printing:

I use pretty printing in Allegro CL.  I would like to run my code on
other lisps.  So, in the other lisps, I first load xp-code.lisp.
However, I always get run-time errors.  Are there known bugs in
xp-code.lisp?  You seemed to suggest that there are.  Is there a
patched version?

For example, I get an error reporting that -1 was given as the first
argument to nthcdr.

The other lisps I'm referring to are CLISP and GCL.

-- 
Benjamin Shults                 Email:  <math.utexas.edu at bshults>
Department of Mathematics       Phone:  (512) 471-7711 ext. 208
University of Texas at Austin   WWW:    http://www.ma.utexas.edu/users/bshults
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