From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,FREEMAIL_FROM autolearn=ham autolearn_force=no version=3.4.4 X-Google-Thread: a07f3367d7,48e1a3c594fb62e8 X-Google-Attributes: gida07f3367d7,public,usenet X-Google-NewGroupId: yes X-Google-Language: ENGLISH,UTF8 Path: g2news2.google.com!news3.google.com!proxad.net!feeder1-2.proxad.net!usenet-fr.net!gegeweb.org!aioe.org!not-for-mail From: =?utf-8?Q?Yannick_Duch=C3=AAne_=28Hibou57?= =?utf-8?Q?=29?= Newsgroups: comp.lang.ada Subject: Re: SPARK Date: Wed, 19 May 2010 23:35:59 +0200 Organization: Ada At Home Message-ID: References: <42a7e70b-b780-4f86-83ca-6cf79ff81dd1@f14g2000vbn.googlegroups.com> NNTP-Posting-Host: H0Ci3WDhdyTdURnA0sNEyw.user.speranza.aioe.org Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed; delsp=yes Content-Transfer-Encoding: Quoted-Printable X-Complaints-To: abuse@aioe.org X-Notice: Filtered by postfilter v. 0.8.2 User-Agent: Opera Mail/10.53 (Win32) Xref: g2news2.google.com comp.lang.ada:11781 Date: 2010-05-19T23:35:59+02:00 List-Id: Le Wed, 19 May 2010 10:09:33 +0200, Phil Thornley = a =C3=A9crit: > For example an inference rule will only be used if it *directly* > proves a conclusion. > Section 7.2.1: "In order for the Simplifier to be able to make use of > the rule, it must find an instance of the rule by pattern-matching it > against the current VC (for inference rules, this essentially means > against the undischarged conclusions of the VC)" Thanks for the detail Phil. > * Except that, of course, the full source of the Simplifier is > available, and there is nothing to stop you making changes to it! Simon has tell about a limit in this area. I see another, which is the = biggest to me : this would be a kind of forking, and a fork is not any = more something common. This would be a valid way for my own use only, = which could not be shared any more ; someone else could not check = something from me using his/her own SPARK installation. I use to be = interested is some specifications of some other languages of the like, = which I've never found, and gave up with the idea (of the probably too = much big work) to attempt to create one, for this exact reason : this = would be specific to me, to what I use. In this area, it is mandatory to= = have standards, otherwise, this is not as much interesting. This is not only about checking for validity, this is also about = expressing why it is so to others in way hey can trust and read.