From: Reiner Steib <reinersteib+gmane@imap.cc>
To: ding@gnus.org
Cc: Dan Nicolaescu <dann@ics.uci.edu>, emacs-devel@gnu.org
Subject: Re: Warning: `mapcar' called for effect; use `mapc' or `dolist'
Date: Mon, 22 Oct 2007 20:49:27 +0200 [thread overview]
Message-ID: <v9fy0356iw.fsf@marauder.physik.uni-ulm.de> (raw)
In-Reply-To: <b4mtzojbb4c.fsf@jpl.org> (Katsumi Yamaoka's message of "Mon, 22 Oct 2007 21:13:39 +0900")
On Mon, Oct 22 2007, Katsumi Yamaoka wrote:
>>>>>> Dan Nicolaescu wrote:
>> The subject is about a new warning produced by the byte
>> compiler. There's a lot of those for gnus.
>> Assuming that all emacs versions that gnus wants to support have
>> either mapc or dolist, can somebody please take care of these
>> warnings?
>
>> Thanks
>
> With No Gnus v0.7 I did `cd lisp; make warn' and tried replacing
> of `mapcar' with `mapc', `dolist', or `while' loops for a while,
> and realized it's not easy and not safe. Ones who do it will
> need to study what things using `mapcar' do in all cases. For
> instance, `mapcar' used in `gnus-group-highlight-line' cannot be
> replaced with `mapc' even if the compiler warns it.
Could the byte-compiler be improved not to warn about such cases?
Here's the relevant code:
(defun gnus-group-highlight-line ()
"Highlight the current line according to `gnus-group-highlight'."
(let* ([...]
(mailp (apply 'append
(mapcar
(lambda (x)
(memq x (assoc (symbol-name
(car (or method gnus-select-method)))
gnus-valid-select-methods)))
'(mail post-mail))))
(level (or (gnus-info-level info) gnus-level-killed))
> In addition, we'd better use `while' loops (or `dolist') rather than
> `mapc' because it is faster, though it needs more work. I think
> it's worth working anyway but it will take time.
Bye, Reiner.
--
,,,
(o o)
---ooO-(_)-Ooo--- | PGP key available | http://rsteib.home.pages.de/
next parent reply other threads:[~2007-10-22 18:49 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <200710200643.l9K6h9gk021348@oogie-boogie.ics.uci.edu>
[not found] ` <b4mtzojbb4c.fsf@jpl.org>
2007-10-22 18:49 ` Reiner Steib [this message]
2007-10-22 20:07 ` Warning: `mapcar' called for effect; use `mapc' or `dolist' Dan Nicolaescu
2007-10-22 20:55 ` Reiner Steib
2007-10-22 21:04 ` Dan Nicolaescu
2007-10-22 21:39 ` Glenn Morris
2007-10-23 1:01 ` Miles Bader
2007-10-23 10:39 ` Richard Stallman
2007-10-23 11:28 ` Miles Bader
2007-10-24 2:50 ` Richard Stallman
2007-10-23 10:39 ` Richard Stallman
[not found] ` <E1IkHAF-00040s-KJ@fencepost.gnu.org>
2007-10-27 10:46 ` Risky variables in Gnus (was: Warning: `mapcar' called for effect; use `mapc' or `dolist') Reiner Steib
2007-10-27 23:41 ` Richard Stallman
2007-10-28 0:02 ` Risky variables in Gnus Reiner Steib
2007-11-01 20:51 ` Reiner Steib
2007-10-31 7:46 ` Warning: `mapcar' called for effect; use `mapc' or `dolist' Richard Stallman
2007-10-31 20:30 ` Reiner Steib
2007-10-31 21:19 ` Glenn Morris
2007-11-01 2:35 ` Katsumi Yamaoka
2007-10-24 19:28 ` Reiner Steib
2007-10-24 22:18 ` Katsumi Yamaoka
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
List information: https://www.gnu.org/software/emacs/
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=v9fy0356iw.fsf@marauder.physik.uni-ulm.de \
--to=reinersteib+gmane@imap.cc \
--cc=Reiner.Steib@gmx.de \
--cc=dann@ics.uci.edu \
--cc=ding@gnus.org \
--cc=emacs-devel@gnu.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
Code repositories for project(s) associated with this public inbox
https://git.savannah.gnu.org/cgit/emacs.git
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).