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From: Miles Bader <miles.bader@necel.com>
To: emacs-devel@gnu.org
Subject: Re: Warning: `mapcar' called for effect; use `mapc' or `dolist'
Date: Tue, 23 Oct 2007 20:28:47 +0900	[thread overview]
Message-ID: <buo640y6pe8.fsf@dhapc248.dev.necel.com> (raw)
In-Reply-To: <E1IkHAU-00044J-9b@fencepost.gnu.org> (Richard Stallman's message of "Tue\, 23 Oct 2007 06\:39\:26 -0400")

Richard Stallman <rms@gnu.org> writes:
>     You should `defvar' mailp then.
>
> It would be unclean for Gnus to put a defvar on a general short name
> like `mailp'.  That is why I think this needs a total rewrite.

In Common-Lisp, I think you use (declare (special VAR ...)) to indicate
a localized use of dynamic binding (as the first thing inside the let
form where it is bound).

Since Elisp already uses `declare' for some other things, it would seem
reasonable to also use it to inform the byte compiler that an apparently
local variable is known to be accessed non-locally.

[That warning is useful -- people often seem to forget to remove unused
let-bindings when the code that uses them is rewritten...]

-Miles

-- 
"Whatever you do will be insignificant, but it is very important that
 you do it."  Mahatma Gandhi

  reply	other threads:[~2007-10-23 11:28 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 [this message]
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

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