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!feeder.eternal-september.org!news.unit0.net!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail
From: Niklas Holsti <niklas.holsti@tidorum.invalid>
Newsgroups: comp.lang.ada
Subject: Re: Mariner 1 / FORTRAN bug
Date: Fri, 9 Aug 2019 09:47:11 +0300
Organization: Tidorum Ltd
Message-ID: <gr4j7bF3aiU1@mid.individual.net>
References: <1992Dec4.141816.1@happy.colorado.edu>
 <86986725-f34e-46d7-9efc-d15d94379048@googlegroups.com>
 <qihm04$h5a$1@dont-email.me>
 <97509e4d-05b9-4b6a-ab12-613abbe562b0@googlegroups.com>
 <qij3pe$3m5$1@dont-email.me>
Mime-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 8bit
X-Trace: individual.net j2qPFb36CSeYGUa2/pBQtA/2YgYGJmdTNkeejER3PZJQmZJ+mk
Cancel-Lock: sha1:0I1Qm2IldyEhbIKK4IpH5AFIzcY=
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:45.0)
 Gecko/20100101 Thunderbird/45.8.0
In-Reply-To: <qij3pe$3m5$1@dont-email.me>
Xref: reader01.eternal-september.org comp.lang.ada:57016
Date: 2019-08-09T09:47:11+03:00
List-Id: <comp.lang.ada>

On 19-08-09 09:28 , J-P. Rosen wrote:
> Le 09/08/2019 à 03:57, robin.vowels@gmail.com a écrit :
>>> While it probably didn't cause the failure of a space probe, people
>>> did get bitten by this language design flaw, which is an example of a
>>> single-character error (added, omitted, or changed) that results in valid
>>> code.
>> Single-character errors are still possible, whatever the language.
>>
> Of course, you can type "-" instead of "+" in any language.
>
> But outside of mathematical formulas, can you give an example of
> single-character error in Ada?

I once declared a record type that contained a component, aptly (I 
thought) called Address, of type System.Address.

Then, in a certain statement dealing with a record object R of that 
type, I mistakenly wrote

    R'Address

when I meant

    R.Address

Silly me.

I now have a personal coding rule: never use the name Address for a 
record component of type System.Address. Perhaps this should be expanded 
to forbid using any record-attribute name as a component name; for 
example, Size.

-- 
Niklas Holsti
Tidorum Ltd
niklas holsti tidorum fi
       .      @       .