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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From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Philipp Stephani <p.stephani2 <at> gmail.com>
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: bug#42147: 28.0.50; pure vs side-effect-free, missing optimizations?
Date: Wed, 29 Jul 2020 10:28:30 -0400

>> > 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.

Indeed, you're right.  In practice this is not a problem, for all kinds
of circumstantial reasons, but in theory you're quite right.


        Stefan
This bug report was last modified 4 years and 281 days ago.

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