bug#61730: 30.0.50; Compiler warnings for delq and delete

[Eli Zaretskii]

> From: Michael Heerdegen <michael_heerdegen@web.de>
> Cc: rms@gnu.org,  mattias.engdegard@gmail.com,  61730@debbugs.gnu.org,
>   monnier@iro.umontreal.ca
> Date: Sat, 25 Feb 2023 13:34:51 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > In Emacs maintenance and development, the two cases are actually one.
> > We rebuild Emacs so frequently that even a "rare" warning appears all
> > the time and is annoying.  It is not a coincidence that we usually
> > don't tolerate warnings during the build of Emacs.
> 
> What's your opinion about the case of non-destructive functions - is it
> ok if we would always warn about thrown away return values of calls of
> them?

What are "non-destructive functions" in this context?