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From: David Delahaye <delahaye@jurancon.inria.fr>
Message-Id: <199805082052.WAA02976@jurancon.inria.fr>
Subject: Filename.chop_suffix
To: caml-list@inria.fr
Date: Fri, 8 May 1998 22:52:50 +0200 (MET DST)
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    Bonsoir,

    Je suis tombe, par hasard, sur une phrase du manuel d'ocaml en ligne qui
m'a un peu interpelle (dans Filename):

> val chop_suffix : string -> string -> string
> 
>      chop_suffix name suff removes the suffix suff from the filename name. The
>      behavior is undefined if name does not end with the suffix suff. 

    Cela ressemble fortement a un trou semantique. Pourquoi ne pas lever tout
simplement une exception qui caracteriserait entierement le comportement de
cette fonction?

    Amicalement.

    David.

===============================================================================
David Delahaye                                 <Email>: David.Delahaye@inria.fr
<Laboratory>: The Coq Project                                  <Domain>: Proofs
<Adress>: INRIA-Rocquencourt Domaine de Voluceau BP105 78153 Le Chesnay Cedex
          FRANCE
<Tel>: (33)-(0)1 39 63 57 53
<Fax>: (33)-(0)1 39 63 56 84
<Url>: http://pauillac.inria.fr/~delahaye
===============================================================================

[If you have time to waste, you can have a look on my proof that all the real
 number are positive. Given x in R:

   x^2>=0                 (well-known result)
   (x^2)^(1/2)>=(0)^(1/2) (use of power on each member)
   x^(2*1/2)>=0           (use of the propertie: (x^n)^m=x^(n*m)
   x^1>=0                 (very easy simplification) 
   x>=0                   (great!)]