From ...
From: Erik Naggum <erik@naggum.no>
Subject: Re: A portable DIRECTORY-P. Re: Here we go again. More CMUCL/ACL pathname differences.
Date: 1999/01/12
Message-ID: <3125173018981162@naggum.no>#1/1
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References: <778kqn$2b2$1@nnrp1.dejanews.com> <efyyanagarp.fsf@whizzy.cc.gatech.edu> <77bdqi$9fk$1@nnrp1.dejanews.com> <3125045622004774@naggum.no> <77e4e3$jrj$1@nnrp1.dejanews.com> <87d84lpaxr.fsf_-_@2xtreme.net> <3125142331394422@naggum.no> <877lususje.fsf@2xtreme.net>
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* cbarry@2xtreme.net (Christopher R. Barry)
| USER(8): (defun logical-pathname-p (pathname)
| 	   (typep pathname 'logical-pathname))
| LOGICAL-PATHNAME-P
| USER(9): (logical-pathname-p "sys:hosts.cl")
| NIL

  why do you expect a string to be a pathname?
 
  do you expect (null "()") to return true, too?

#:Erik