From: Richard Stallman <rms@gnu.org>
To: Reiner Steib <Reiner.Steib@gmx.de>
Cc: dann@ics.uci.edu, ding@gnus.org, emacs-devel@gnu.org
Subject: Re: Warning: `mapcar' called for effect; use `mapc' or `dolist'
Date: Wed, 31 Oct 2007 03:46:58 -0400 [thread overview]
Message-ID: <E1In8Hy-0000P7-WB@fencepost.gnu.org> (raw)
In-Reply-To: <v93aw2amym.fsf@marauder.physik.uni-ulm.de> (message from Reiner Steib on Mon, 22 Oct 2007 22:55:29 +0200)
[I sent this message a week ago but did not get a response.]
> > (defun gnus-group-highlight-line ()
> > "Highlight the current line according to `gnus-group-highlight'."
[...]
> It seems that `mailp' is not used in that function.
`mailp' is used implicitly through the variable `gnus-group-highlight'
which is let-bound to `list'. `list' is used in the body of the
let-form.
> Adding a use for it makes the warning go away...
If the byte compiler warns about that case, it is being too ambitious.
Thus, if the value of an expression is stored into a variable, the
compiler should consider the value "used".
So if this warning really happens, it is a bug.
Can it be reproduced?
next prev parent reply other threads:[~2007-10-31 7:46 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 ` Warning: `mapcar' called for effect; use `mapc' or `dolist' Reiner Steib
2007-10-22 20:07 ` 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 ` Richard Stallman [this message]
2007-10-31 20:30 ` Warning: `mapcar' called for effect; use `mapc' or `dolist' 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
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