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bug#55205: 28.1.50; completion--replace illegally mutates completion can

From: Eli Zaretskii
Subject: bug#55205: 28.1.50; completion--replace illegally mutates completion candidates
Date: Mon, 02 May 2022 05:23:10 +0300 
> Date: Sun, 1 May 2022 23:11:36 +0300
> Cc: mail@daniel-mendler.de, monnier@iro.umontreal.ca, 55205@debbugs.gnu.org
> From: Dmitry Gutov <dgutov@yandex.ru>
> 
> On 01.05.2022 15:17, Eli Zaretskii wrote:
> > I don't understand how can completion work in general without
> > destructively modifying strings.  Isn't that obvious?
> 
> It shouldn't modify the strings "owner" by outside code. String that can 
> be referenced by other constants/functions/etc.
> 
> The easiest way to avoid that is to copy the whole collection and then 
> modify the copied strings. But different approaches exist.

Collection can include functions, and how do you copy that?
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