From: Markus Mottl <markus@oefai.at>
To: John Prevost <visigoth@cs.cmu.edu>
Cc: OCaml Mailing list <caml-list@inria.fr>
Subject: Re: [Caml-list] Breaking out of iterative loops
Date: Thu, 2 May 2002 10:33:35 +0200 [thread overview]
Message-ID: <20020502083335.GB16030@fichte.ai.univie.ac.at> (raw)
In-Reply-To: <863cxbmgww.fsf@laurelin.dementia.org>
On Wed, 01 May 2002, John Prevost wrote:
> The drawback to allowing:
>
> let rec ones = 1 :: ones
>
> and such expressions is that when looking at the definition of, for
> example, 'a list and length, one would expect it to be guaranteed that
> length terminates. Since you can't prevent recursive use of
> constructors, well, you can no longer guarantee that.
I second this. Does anybody here really benefit from such cyclic
structures?
I haven't found a single practical case where this was useful, but would
assume that some future program transformation tools that use proofs by
induction would have an easier life if this were disallowed...
Regards,
Markus Mottl
--
Markus Mottl markus@oefai.at
Austrian Research Institute
for Artificial Intelligence http://www.oefai.at/~markus
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next prev parent reply other threads:[~2002-05-02 8:33 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-04-30 20:27 Vincent Foley
2002-04-30 21:38 ` Johan Baltié
2002-05-02 0:57 ` John Max Skaller
2002-05-02 2:18 ` John Prevost
2002-05-02 8:33 ` Markus Mottl [this message]
2002-05-02 9:14 ` Francois Pottier
2002-05-02 9:50 ` Alain Frisch
2002-05-02 14:35 ` Alessandro Baretta
2002-05-02 15:40 ` John Max Skaller
2002-05-02 13:15 Krishnaswami, Neel
2002-05-02 13:34 ` Markus Mottl
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