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Re: () as an expression

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