From mboxrd@z Thu Jan  1 00:00:00 1970
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on
	ip-172-31-74-118.ec2.internal
X-Spam-Level: 
X-Spam-Status: No, score=-1.9 required=3.0 tests=BAYES_00 autolearn=ham
	autolearn_force=no version=3.4.6
Path: eternal-september.org!reader02.eternal-september.org!aioe.org!pBWEO6hi52oGFheO/GY5ag.user.gioia.aioe.org.POSTED!not-for-mail
From: Stephen Leake <stephen_leake@stephe-leake.org>
Newsgroups: comp.lang.ada
Subject: Re: calling function but ignoring results
Date: Wed, 30 Jun 2021 17:06:27 -0700
Organization: Aioe.org NNTP Server
Message-ID: <867diayk1o.fsf@stephe-leake.org>
References: <69a59fdc-72bb-4202-99fc-d776530de653n@googlegroups.com>
NNTP-Posting-Host: pBWEO6hi52oGFheO/GY5ag.user.gioia.aioe.org
Mime-Version: 1.0
Content-Type: text/plain
X-Complaints-To: abuse@aioe.org
User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/28.0.50 (windows-nt)
X-Notice: Filtered by postfilter v. 0.9.2
Cancel-Lock: sha1:8b5qMyAnXr2qWloC9x7w5xg++Dk=
Xref: reader02.eternal-september.org comp.lang.ada:62311
List-Id: <comp.lang.ada>

Matt Borchers <mattborchers@gmail.com> writes:

> It is not very often that ignoring a function result is okay, but I
> have run across many instances of the following block structure in
> code over the years:
>
> declare
>     dont_care : BOOLEAN;
> begin
>     dont_care := foo( x, y );
> end;

With, GNAT, this can be:

declare
    dont_care : BOOLEAN := foo( x, y );
    pragma Unreferenced (dont_care);
begin
    null;
end;

which makes the intent clear. I don't know if Unreferenced was proposed
as a language addition; it's not in Ada 202x.

--
-- Stephe