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: 42147-done <at> debbugs.gnu.org, Paul Eggert <eggert <at> cs.ucla.edu>, Andrea Corallo <andrea_corallo <at> yahoo.it>, Andrea Corallo <akrl <at> sdf.org>
Subject: bug#42147: 28.0.50; pure vs side-effect-free, missing optimizations?
Date: Thu, 09 Jul 2020 08:47:03 -0400

> String mutation is something of a special case: it is rare, yet its mere
> possibility incurs costs even for code that doesn't use it.

Yes and no: it's *very* rare to change the sequence of characters which
compose a string, yes, but until the addition of `propertize` (in
Emacs-21) mutation was the only way to add text-properties to a string,
so it's still quite common.



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

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