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 16:09:40 +0100
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > > 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?
> 
> I mean all functions with either no side effects or such which may alter
> original list structures but in unpredictable ways so that only the
> return value is ever useful.

Thanks.  I guess this should be okay, but a test run over our sources
would be prudent before the final decision.