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From: roderic@vicom.com (Roderic Taylor)
Newsgroups: comp.lang.scheme
Subject: Re: () as an expression
Message-ID: <1990Jan23.203035.148@vicom.com>
Date: 23 Jan 90 20:30:35 GMT
References: <1990Jan16.193134.10491@sun.soe.clarkson.edu>
Organization: Vicom Systems Inc., San Jose, CA
Lines: 11

In a recent article Jason Coughlin (jk0@sun.soe.clarkson.edu) writes:

=
=Why is () an invalid expression?  It seems to me that it is a constant.
=

   () is not a constant.  '() is a constant (at least in the sense
you're thinking).  This is the way Lisp works with all lists, not
just the empty one.

                                            --Roderic T