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=0.2 required=5.0 tests=BAYES_00,INVALID_MSGID,
	REPLYTO_WITHOUT_TO_CC autolearn=no autolearn_force=no version=3.4.4
X-Google-Language: ENGLISH,ASCII-7-bit
X-Google-Thread: fac41,9a0ff0bffdf63657
X-Google-Attributes: gidfac41,public
X-Google-Thread: f43e6,9a0ff0bffdf63657
X-Google-Attributes: gidf43e6,public
X-Google-Thread: 1108a1,9a0ff0bffdf63657
X-Google-Attributes: gid1108a1,public
X-Google-Thread: 103376,4b06f8f15f01a568
X-Google-Attributes: gid103376,public
From: Loryn Jenkins <loryn@s054.aone.net.au>
Subject: Re: Software landmines (loops)
Date: 1998/09/01
Message-ID: <35EAEC47.164424A7@s054.aone.net.au>#1/1
X-Deja-AN: 386514247
Content-Transfer-Encoding: 7bit
References: <slrn6sopmg.4fg.jdege@jdege.visi.com>
 <rfzpddz3s2.fsf@bnp-eng.remcomp.com>
 <902934874.2099.0.nnrp-10.c246a717@news.demon.co.uk> <dewar.903074236@merv>
 <6r1glm$bvh$1@nnrp1.dejanews.com> <dewar.903281994@merv>
 <6r9f8h$jtm$1@nnrp1.dejanews.com> <6renh8$ga7$1@nnrp1.dejanews.com>
 <6rf59b$2ud$1@nnrp1.dejanews.com> <l5HC1.6840$wN.1856764@news.giganews.com>
 <6rfra4$rul$1@nnrp1.dejanews.com> <35DBDD24.D003404D@calfp.co.uk>
 <m3ogt3qgca.fsf@mheaney.ni.net> <6sbuod$fra$1@hirame.wwa.com>
 <35f51e53.48044143@ <m3af4mq7f4.fsf@mheaney.ni.net>
 <904556531.666222@miso.it.uq.edu.au> <m31zpxqutn.fsf@mheaney.ni.net>
X-Priority: 3 (Normal)
Content-Type: text/plain; charset=us-ascii
X-Trace: news.mel.aone.net.au 904588443 24069 203.12.186.92 (31 Aug 1998
 18:34:03 GMT)
Organization: TekRite Pty Ltd
Mime-Version: 1.0
Reply-To: loryn@acm.org
NNTP-Posting-Date: 31 Aug 1998 18:34:03 GMT
Newsgroups: comp.lang.eiffel,comp.object,comp.software-eng,comp.lang.ada
Date: 1998-08-31T18:34:03+00:00
List-Id: <comp.lang.ada>

How is this more complicated? 

equal (l,r: LIST): BOOLEAN is
	require
		l.count = r.count
	do
		Result := l.first /= r.first
		if Result then
			from
				l.start; r.start
			until
				not Result or l.off
			loop
				Result := l.item /= r.item
				l.forth; r.forth
			end
		end
	end

Sorry for the language change ... it's the one I'm familiar with.

By the way, I'm not sure whether it's a problem in your Ada code, but my
Eiffel code could fail if r has greater or fewer items than l. Hence the
precondition.

Loryn Jenkins