Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!elroy!ucla-cs!pierce
From: pierce@lanai.cs.ucla.edu
Newsgroups: comp.lang.scheme
Subject: unspecified-object
Keywords: standard, unspecified
Message-ID: <24169@shemp.CS.UCLA.EDU>
Date: 23 May 89 01:51:40 GMT
Sender: news@CS.UCLA.EDU
Reply-To: pierce@CS.UCLA.EDU ()
Distribution: na
Organization: UCLA Computer Science Department
Lines: 8


   I think that the specification of Scheme, as well as many Scheme programs,
   would be made more elegant if an "unspecified-object" analogous to NaN in 
   the IEEE numeric standard were introduced. Functions which return 
   unspecified values now would be required to return an "unspecified-object"
   instead.

   -- Brad