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 autolearn=unavailable autolearn_force=no version=3.4.4 Path: eternal-september.org!reader01.eternal-september.org!reader02.eternal-september.org!.POSTED!not-for-mail From: G. B. Newsgroups: comp.lang.ada Subject: Re: How to get Ada to "cross the chasm"? Date: Fri, 27 Apr 2018 09:23:08 -0000 (UTC) Organization: A noiseless patient Spider Message-ID: References: <1c73f159-eae4-4ae7-a348-03964b007197@googlegroups.com> <878t9nemrl.fsf@nightsong.com> <87h8o7lowg.fsf@nightsong.com> <8736zqkwat.fsf@nightsong.com> <6839088c-f221-4650-a6ea-1841ae539486@googlegroups.com> <1e5f5681-0e2a-43cc-9437-2bd38078da08@googlegroups.com> <87604lvkqp.fsf@nightsong.com> <0bd80336-595a-45b6-b4e5-26c13d5859cb@googlegroups.com> <87o9idsh7f.fsf@nightsong.com> <87k1t1s9lx.fsf@nightsong.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Injection-Date: Fri, 27 Apr 2018 09:23:08 -0000 (UTC) Injection-Info: reader02.eternal-september.org; posting-host="d910b4b7b92a862b96708d5cbaf30791"; logging-data="17603"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+4fjTa8Vjiob+zc+uDAUBH0swGd3pcZ9c=" User-Agent: NewsTap/5.3.1 (iPhone/iPod Touch) Cancel-Lock: sha1:5vITEJjxW65szIf919MOefqkvHU= sha1:EPbYAoyH1qnuJvMAayUFB9QAp8k= Xref: reader02.eternal-september.org comp.lang.ada:51747 Date: 2018-04-27T09:23:08+00:00 List-Id: Dmitry A. Kazakov wrote: > It is impossible to prove everything, neither theoretically nor > practically. Hence dynamic checks that, if used as defined in „Design by Contract“, will give programmers a way of trying another solution at runtime. Seems different than just halting the program because mathematics could not deliver a complete demonstration of the program’s never-fails property.