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- Newsgroups: comp.lang.scheme
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- From: brent@ssd.csd.harris.com (Brent Benson)
- Subject: Re: Unspecified values in R4RS
- Organization: Harris Computer Systems
- Date: Fri, 22 Jan 1993 13:51:02 GMT
- Message-ID: <BRENT.93Jan22085102@rcx1.ssd.csd.harris.com>
- In-Reply-To: bh@anarres.CS.Berkeley.EDU's message of 21 Jan 1993 22:23:26 GMT
- References: <1993Jan21.195822.23639@sqwest.wimsey.bc.ca>
- <1jn7ou$m5n@agate.berkeley.edu>
- Sender: news@grouper.mkt.csd.harris.com (Network News)
- Lines: 18
-
- bh@anarres.CS.Berkeley.EDU (Brian Harvey) writes:
-
- > About unspecified values, in my *strong* opinion these should all be
- > expunged from the standard and replaced with a nonprinting value, and
- > the procedures that now have unspecified return values should all be
- > required to return that.
-
- Implementations are free to return a non-printing value for
- unspecified return values. It seems like a bad idea to mandate a
- non-printing unspecified return value when there is no clear evidence
- that it is the most useful or understandable. I think it's a good
- idea to let implementors try different ideas and see what works best.
- Implementators and users will gravitate towards what works.
-
-
- --
- Brent Benson
- Harris Computer Systems
-