GNU bug report logs - #42147
28.0.50; pure vs side-effect-free, missing optimizations?

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Package: emacs;

Reported by: Andrea Corallo <andrea_corallo <at> yahoo.it>

Date: Tue, 30 Jun 2020 22:28:02 UTC

Severity: normal

Found in version 28.0.50

Done: Mattias Engdegård <mattiase <at> acm.org>

Bug is archived. No further changes may be made.

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Message #271 received at 42147 <at> debbugs.gnu.org (full text, mbox):

From: Philipp Stephani <p.stephani2 <at> gmail.com>
To: Stefan Monnier <monnier <at> iro.umontreal.ca>
Cc: Mattias Engdegård <mattiase <at> acm.org>,
 Paul Eggert <eggert <at> cs.ucla.edu>, Andrea Corallo <andrea_corallo <at> yahoo.it>,
 42147 <at> debbugs.gnu.org
Subject: Re: bug#42147: 28.0.50;
 pure vs side-effect-free, missing optimizations?
Date: Wed, 29 Jul 2020 14:53:55 +0200

Am So., 26. Juli 2020 um 00:27 Uhr schrieb Stefan Monnier
<monnier <at> iro.umontreal.ca>:
>
> >> > There are also some functions declared 'pure' that appear to have side
> >> > effects: kbd, package-get-version
> >>
> >> Which side-effects are you thinking of?
> >>
> >
> > I wouldn't know about side effects, but `kbd' is definitely not pure
> > by the "homomorphism w.r.t. eql" definition as it takes a string
> > argument.
>
> Taking string arguments is not a problem (`eql` strings are also
> `equal`).

Only if the strings aren't modified between two invocations.
This bug report was last modified 4 years and 281 days ago.

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