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!news.eternal-september.org!mx02.eternal-september.org!.POSTED!not-for-mail
From: Brian Drummond <brian@shapes.demon.co.uk>
Newsgroups: comp.lang.ada
Subject: Re: Haskell, anyone?
Date: Mon, 16 Nov 2015 14:38:55 -0000 (UTC)
Organization: A noiseless patient Spider
Message-ID: <n2cppv$a41$1@dont-email.me>
References: <c6ac0d2f-52af-4aa6-ba6f-34f61e3c93e8@googlegroups.com>
	<dd1ada14-493d-44fc-a081-3a69515f2702@googlegroups.com>
	<n2b23f$aom$1@speranza.aioe.org> <87mvue50ey.fsf@ixod.org>
	<87d1vaoa6y.fsf@nightsong.com> <n2bosk$gsq$1@speranza.aioe.org>
	<lyegfqib83.fsf@pushface.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Injection-Date: Mon, 16 Nov 2015 14:38:55 -0000 (UTC)
Injection-Info: mx02.eternal-september.org;
 posting-host="da745e888d4a5182b5fda6212bbb0a63";
	logging-data="10369"; mail-complaints-to="abuse@eternal-september.org";
	posting-account="U2FsdGVkX1+84VeFYjpWVKCZNJNAAo89Y2c/mYqDnfY="
User-Agent: Pan/0.139 (Sexual Chocolate; GIT bf56508
 git://git.gnome.org/pan2)
Cancel-Lock: sha1:D6gH/tdvC2gpVZE2iZKhlm3wCOc=
Xref: news.eternal-september.org comp.lang.ada:28402
Date: 2015-11-16T14:38:55+00:00
List-Id: <comp.lang.ada>

On Mon, 16 Nov 2015 08:45:32 +0000, Simon Wright wrote:

> "Nasser M. Abbasi" <nma@12000.org> writes:

>>>gnatmake foo.adb
>> gcc-4.8 -c foo.adb foo.adb:8:12: warning: value not in range of type
>> "I" defined at line 4 foo.adb:8:12: warning: "Constraint_Error" will be
>> raised at run time
> 
> The compiler can only do this because the values and the assignment are
> close enough (in the same scope?). How often does this sort of mistake
> happen IRL?

Often enough to make the warning worthwhile : I've seen it at least once 
IRL. 

But you're correct : even passing one of the expression variables in as a 
parameter is enough to defeat the warning, even whet the actual parameter 
is a constant - or even a literal. That case too could potentially be 
warned about, but then you're well into the realm of diminished returns.

-- Brian