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Re: Is it ok to sort a list of overlays destructively?

From: Marcin Borkowski
Subject: Re: Is it ok to sort a list of overlays destructively?
Date: Fri, 30 Jul 2021 21:27:01 +0200
User-agent: mu4e 1.1.0; emacs 28.0.50

On 2021-07-29, at 14:33, Eli Zaretskii <> wrote:

>> From: John Yates <>
>> Date: Thu, 29 Jul 2021 07:34:07 -0400
>> Cc: Help Gnu Emacs mailing list <>
>> On Wed, Jul 28, 2021 at 7:44 AM Eli Zaretskii <> wrote:
>> >
>> > Basically, you should assume that Emacs protects itself where that is
>> > needed, so if it handed you a list or some other data, and nothing in
>> > the doc string warns you against doing something with that data, you
>> > are free to do that, and if that causes unexpected results, there's
>> > either a documentation bug or a code bug that needs to be fixed.
>> I am not sure if such a statement exists in any of the manuals. Should
>> it not be stated explicitly somewhere?
> I don't think it should be, no.  It's pretty much obvious, IMO.


thank you very much for all your input here.  After so many years with
Emacs and Elisp, I still learn a lot!


Marcin Borkowski

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