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RE: Predicate for true lists

From: Drew Adams
Subject: RE: Predicate for true lists
Date: Mon, 4 Jun 2018 20:12:32 -0700 (PDT)

> > (null (cdr (last xs))), which is
> > (and list  (nthcdr (1- (safe-length xs)) xs))).
> Forgot to mention that by the manual's definition of "true list",
> and by this code for it, a circular list _is_ a true list.  Dunno
> whether that was the intention of the OP's "true list".
> (null (cdr (last #1='(2 3 #1#)))) = t

I should have said that _some_ circular lists are "true lists".

(null (cdr (last #1='(2 3 #1# . 5)))) = nil

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