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

[Eli Zaretskii]

> From: Marcin Borkowski <mbork@mbork.pl>
> Date: Tue, 27 Jul 2021 07:22:42 +0200
> 
> I need to sort the list of overlays returned by `overlays-in'.  The docs
> for that function do not says explicitly that it creates a new list
> every time, although a cursory glance at its source says that it
> apparently does.

Yes, it's a list that is created specifically for this function, and
every time anew.  (Internally, overlays of a buffer aren't stored as a
single list, so returning anything but a copy would be impossible.)

The doc string kinda hints on that, since it talks about sorting the
list, which would be unthinkable if it were the internal storage.