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

From: Stefan Monnier <monnier <at> iro.umontreal.ca>
To: Mattias Engdegård <mattiase <at> acm.org>
Cc: 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: Thu, 02 Jul 2020 11:49:04 -0400

> Conses are mutable and thus each have their own identity. Numbers are
> immutable and have none; there is no defined way to distinguish two numbers
> that have the same value ('eq' does not give well-defined results).

Better yet, there's still hope that we change things such that `eq`
behaves like `eql` on bignums (and maybe also on floats).


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

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