From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 4.0.1 (2024-03-25) on
	ip-172-31-91-241.ec2.internal
X-Spam-Level: 
X-Spam-Status: No, score=0.0 required=3.0 tests=none autolearn=ham
	autolearn_force=no version=4.0.1
Path: nntp.eternal-september.org!eternal-september.org!feeder.eternal-september.org!.POSTED!not-for-mail
From: Lawrence =?iso-8859-13?q?D=FFOliveiro?= <ldo@nz.invalid>
Newsgroups: comp.lang.ada
Subject: Re: In precision typing we trust
Date: Sat, 30 Aug 2025 22:25:46 -0000 (UTC)
Organization: A noiseless patient Spider
Message-ID: <108vtpa$2sngv$2@dont-email.me>
References: <107uv9g$3019a$1@dont-email.me> <107v1ji$303of$1@dont-email.me>
	<336fbb5f-a279-ea8e-67fd-f62bb00d6a89@irrt.De>
	<107vfb9$34cpj$1@dont-email.me> <mgmhbtF8u6bU1@mid.individual.net>
	<10855lq$gj8l$1@dont-email.me> <1088h1a$19635$1@dont-email.me>
	<1089p1i$1ig1d$1@dont-email.me> <108aq2p$1qo9o$1@dont-email.me>
	<108b1r3$1sj3c$1@dont-email.me> <108dh4t$2f5h3$2@dont-email.me>
	<108dkik$2g20p$1@dont-email.me> <108g1cg$32gqg$2@dont-email.me>
	<108h6b0$3a75k$2@dont-email.me> <108iiq5$3lihe$3@dont-email.me>
	<108mhhk$j2jt$1@dont-email.me> <108mis1$j4cj$1@dont-email.me>
	<108o33p$vok4$5@dont-email.me> <108o6rp$10njb$1@dont-email.me>
	<108o7cm$10qct$1@dont-email.me> <108o845$10pj9$3@dont-email.me>
	<108p65h$17vk1$1@dont-email.me> <108p8bi$16qn1$6@dont-email.me>
	<108r89p$1osg9$4@dont-email.me> <108rnjs$1rkon$3@dont-email.me>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Injection-Date: Sat, 30 Aug 2025 22:25:46 +0000 (UTC)
Injection-Info: dont-email.me; posting-host="c0b3afac58395fcfe10cd8a8a01c5d34";
	logging-data="3038751"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX1/9dz+r8++7VIYb9Rq6Ul5I"
User-Agent: Pan/0.163 (Kryvyi Rih)
Cancel-Lock: sha1:rhddALlVyK+bnVgofIgnV/BvjmQ=
Xref: feeder.eternal-september.org comp.lang.ada:67001
List-Id: <comp.lang.ada>

On Fri, 29 Aug 2025 10:15:56 +0200, Dmitry A. Kazakov wrote:

> On 2025-08-29 05:54, Lawrence D’Oliveiro wrote:
>>
>> On Thu, 28 Aug 2025 11:43:15 +0200, Dmitry A. Kazakov wrote:
>> 
>>> In Python everything is untyped even when type annotations are used.
>> 
>>      Python 3.13.7 (main, Aug 20 2025, 22:17:40) [GCC 14.3.0] on linux
>>      Type "help", "copyright", "credits" or "license" for more information.
>>      >>> 2 + "2"
>>      Traceback (most recent call last):
>>        File "<python-input-0>", line 1, in <module>
>>          2 + "2"
>>          ~~^~~~~
>>      TypeError: unsupported operand type(s) for +: 'int' and 'str'
> 
> "+" is implemented to raise an exception named TypeError. So? How is 
> that a type check?

You mean it doesn’t do type checking in Ada??

> How do I know if that happens without executing "+"?

Look at the definitions of the classes involved.

> It is just untyped as no types of "+" are specified anywhere.

They are in the classes that implement that operator.

> It is an undefined behavior ...

It is defined in the classes that implement that operator.