From: Glenn Morris <rgm@gnu.org>
To: rms@gnu.org
Cc: dann@ics.uci.edu, ding@gnus.org,
Reiner Steib <Reiner.Steib@gmx.de>,
emacs-devel@gnu.org
Subject: Re: Warning: `mapcar' called for effect; use `mapc' or `dolist'
Date: Wed, 31 Oct 2007 17:19:23 -0400 [thread overview]
Message-ID: <b3fxzrq8x0.fsf@fencepost.gnu.org> (raw)
In-Reply-To: E1In8Hy-0000P7-WB@fencepost.gnu.org
Richard Stallman wrote:
> 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?
There's nothing to worry about AFAICS:
(let ((foo (mapcar (lambda (e) e) '(a b c))))) ; warning
(let ((foo (mapcar (lambda (e) e) '(a b c)))) ; no warning
foo)
(defvar foo nil)
(defun foo-func ()
foo)
(let ((foo (mapcar (lambda (e) e) '(a b c)))) ; no warning
(foo-func))
next prev parent reply other threads:[~2007-10-31 21:19 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 ` 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 [this message]
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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