On 8/31/06, John Cowan <[EMAIL PROTECTED]> wrote:
While messing around with some stuff in Paul Graham's paper "The Roots
of Lisp" I was quite surprised to find that Chicken's "atom?" predicate
returns #f on the empty list. This is the documented behavior.
This is contrary to historic practice from Lisp 1.5 through Common Lisp.
(Of course that is partly because () = NIL in that tradition, and NIL
is a symbol.) R1RS was the last Scheme standard to specify ATOM, and
it had the same semantics then.
Why was this changed? Can it be fixed?
I have changes this. Note that "atom?" is now equivalent to
"not-pair?".
cheers,
felix
--
http://galinha.ucpel.tche.br:8081/blog/blog.ssp
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