Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!usc!snorkelwacker!bloom-beacon!ATT-IN.ATT.COM!postmaster From: postmaster@ATT-IN.ATT.COM Newsgroups: comp.lang.scheme Subject: (none) Message-ID: <9001241701.aa08530@mintaka.lcs.mit.edu> Date: 24 Jan 90 21:56:45 GMT Sender: root@athena.mit.edu (Wizard A. Root) Organization: The Internet Lines: 45 Mail to `att.att.com!attmail!mhs!envoy!ics.test/pn=_test_group' alias `att!attmail!mhs!envoy!ics.test/pn=_test_group' from 'CUNYVM.CUNY.EDU!Scheme%lcs.mit.edu' failed. The error message was: destination unknown or forwarding disallowed The message began: Received: from SCF.FUNDP.AC.BE by CUNYVM.CUNY.EDU (IBM VM SMTP R1.2.2MX) with BSMTP id 5831; Wed, 24 Jan 90 16:57:21 EST Received: by BNANDP11 (Mailer R2.02A) id 9431; Wed, 24 Jan 90 18:36:28 +0100 Date: Wed, 24 Jan 90 02:15:06 EST Reply-To: Scheme%lcs.mit.edu@CUNYVM.CUNY.EDU Sender: Scheme Programming Language From: Automatic Scheme Digestifier Subject: Scheme Digest #280 Comments: To: Scheme@lcs.mit.edu To: ICSUG TEST GROUP Scheme Digest #280 24 Jan 90 02:15:06 EST Today's Topics: () as an expression ---------------------------------------------------------------------- Message-ID: <1990Jan23.203035.148@vicom.com> Date: 23 Jan 90 20:30:35 GMT From: Roderic Taylor To: scheme@mc.lcs.mit.edu Subject: 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 ------------------------------ End of Scheme Digest ********************