GNU bug report logs - #34708
alist-get has unclear documentation

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Package: emacs;

Reported by: "Miguel V. S. Frasson" <mvsfrasson <at> gmail.com>

Date: Sat, 2 Mar 2019 04:52:01 UTC

Severity: minor

Done: Michael Heerdegen <michael_heerdegen <at> web.de>

Bug is archived. No further changes may be made.

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Message #107 received at 34708 <at> debbugs.gnu.org (full text, mbox):

From: Michael Heerdegen <michael_heerdegen <at> web.de>
To: Drew Adams <drew.adams <at> oracle.com>
Cc: Eric Abrahamsen <eric <at> ericabrahamsen.net>, 34708 <at> debbugs.gnu.org
Subject: Re: bug#34708: alist-get has unclear documentation
Date: Tue, 12 Mar 2019 18:55:56 +0100

Drew Adams <drew.adams <at> oracle.com> writes:

> > But isn't that trivial?  How else could we add associations?
>
> Yes, it's true of `setf' in general.  It's still worth repeating, I
> think (just one opinion).  One person's "trivial" is another's
> "gotcha".

Actually, it's not even trivial at all.  Setting alist-get as place
could also build a new alist, leaving the one stored in the ALIST place
intact, and set place ALIST to the new list.  But it potentially
modifies the list stored in place ALIST.  That's not inevitable, so it
could be worth telling that.

Michael.
This bug report was last modified 6 years and 31 days ago.

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