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: Mattias Engdegård <mattiase <at> acm.org>
Cc: Philipp Stephani <p.stephani2 <at> gmail.com>, 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 16:39:52 -0400

> Regarding package-get-version: perhaps we should drop the 'pure' property
> and just let callers wrap it in eval-when-compile?

I'd rather not: the benefit is too subtle, I'd expect most users won't
know/bother to use `eval-when-compile` around it even though I'd expect
a vast majority of the uses can benefit from compile-time evaluation.
In contrast the cases where the impurity will get in the way
should be rare.  Feel free to add a `save-match-data` if you think it's
worth the trouble (but please include a comment explaining it's only
there in order to satisfy the `pure` annotation).


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

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