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From: =?iso-8859-15?Q?Yannick_Duch=EAne_=28Hibou57=29?=
 <yannick_duchene@yahoo.fr>
Newsgroups: comp.lang.ada
Subject: Re: SPARK : surprising failure with implication
Date: Wed, 02 Jun 2010 10:59:26 +0200
Organization: Ada At Home
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Date: 2010-06-02T10:59:26+02:00
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Le Wed, 02 Jun 2010 10:55:48 +0200, Dmitry A. Kazakov  =

<mailbox@dmitry-kazakov.de> a =E9crit:
> Disproving the antecedent from wrong consequent is not very common.
It is to me, and not only with SPARK rules, this is why I though to use =
it  =

in this context.

Thanks to have pointed this may not seems common to every one, as I was =
 =

not aware of this.

> None, except that what looks obvious for a man is not for a computer a=
nd
> conversely. (:-))
You are right Dmitry ;) That is a nice sentence in all of its  =

interpretations.


-- =

There is even better than a pragma Assert: a SPARK --# check.
--# check C and WhoKnowWhat and YouKnowWho;
--# assert Ada;
--  i.e. forget about previous premises which leads to conclusion
--  and start with new conclusion as premise.