Edi Weitz  <spamtrap@agharta.de> wrote:
+---------------
| rpw3@rpw3.org (Rob Warnock) wrote:
| > p.s. IIRC, I first heard this recommendation & rationale from Erik
| > Naggum.
| 
| Based on an idea from Paul Dietz:
|   <http://groups.google.com/group/comp.lang.lisp/msg/00a479f66b418600>
+---------------

Actually, looking again at the whole thread, I believe Thomas Russ
was also one of the first to mention using "empty forms in OR or AND":

  <http://groups.google.com/group/comp.lang.lisp/msg/54c7cd87edd42947>

In any case, I came away with a strong feeling that #+(AND) and #-(AND)
for "enable" and "disable", resp., were far & away the best of the all
of the alternatives discussed: portable [pure CLHS], "natural" with
respect to "+/-", and easily remembered.

I've been using them ever since...  ;-}  ;-}


-Rob

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