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 #229 received at 42147-done <at> debbugs.gnu.org (full text, mbox):

From: Andrea Corallo <akrl <at> sdf.org>
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-done <at> debbugs.gnu.org
Subject: Re: bug#42147: 28.0.50;
 pure vs side-effect-free, missing optimizations?
Date: Thu, 09 Jul 2020 15:37:59 +0000

Stefan Monnier <monnier <at> iro.umontreal.ca> writes:

>> What's your suggestion on this optimization? Do you think can be on with
>> default settings or is it dangerous?
>
> AFAICT it's been on since Emacs-21, which seems to argue for "not too dangerous".

Great, thanks both for your suggestions.

BTW IMO if the only way to *certainly* get a mutable string is with
`copy-sequence' or `make-string' I think we could document it.  Is a
simple rule easy to understand and clarifies the situation.

  Andrea

-- 
akrl <at> sdf.org
This bug report was last modified 4 years and 281 days ago.

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