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Message from discussion I never realized the funny difference between nil and () before.
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Barry Fishman  
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 More options Nov 3 2011, 11:40 am
Newsgroups: comp.lang.lisp
From: Barry Fishman <barry_fish...@acm.org>
Date: Thu, 03 Nov 2011 11:40:36 -0400
Local: Thurs, Nov 3 2011 11:40 am
Subject: Re: I never realized the funny difference between nil and () before.
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On 2011-11-03 01:46:37 EDT, Kaz Kylheku wrote:

> (QUOTE X) and X is the same thing for any X which evaluates to itself!

I don't think so.  They evaluate to the same thing.  This is an
important distinction when writing macros:

 (non-eval-eq (a b)
   `(eq ',a ',b))

 (non-eval-eq (quote nil) nil)
 ==> nil
 (non-eval-eq () nil)
 ==> t

--
Barry Fishman


 
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