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Re: Warning: `mapcar' called for effect; use `mapc' or `dolist'
From: |
Reiner Steib |
Subject: |
Re: Warning: `mapcar' called for effect; use `mapc' or `dolist' |
Date: |
Wed, 31 Oct 2007 21:30:23 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/23.0.50 (gnu/linux) |
On Wed, Oct 31 2007, Richard Stallman wrote:
> > > (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?
I can't reproduce it. I just updated and bootstrapped. There was no
warning for `gnus-group.el':
Compiling [...]/cvs-HEAD/emacs/lisp/./gnus/gnus-group.el
Wrote [...]/cvs-HEAD/emacs/lisp/gnus/gnus-group.elc
Bye, Reiner.
--
,,,
(o o)
---ooO-(_)-Ooo--- | PGP key available | http://rsteib.home.pages.de/
- Re: Warning: `mapcar' called for effect; use `mapc' or `dolist', (continued)
- Re: Warning: `mapcar' called for effect; use `mapc' or `dolist', Glenn Morris, 2007/10/22
- Re: Warning: `mapcar' called for effect; use `mapc' or `dolist', Miles Bader, 2007/10/22
- Re: Warning: `mapcar' called for effect; use `mapc' or `dolist', Richard Stallman, 2007/10/23
- Re: Warning: `mapcar' called for effect; use `mapc' or `dolist', Miles Bader, 2007/10/23
- Re: Warning: `mapcar' called for effect; use `mapc' or `dolist', Richard Stallman, 2007/10/23
- Re: Warning: `mapcar' called for effect; use `mapc' or `dolist', Richard Stallman, 2007/10/23
- Message not available
- Risky variables in Gnus (was: Warning: `mapcar' called for effect; use `mapc' or `dolist'), Reiner Steib, 2007/10/27
- Re: Risky variables in Gnus (was: Warning: `mapcar' called for effect; use `mapc' or `dolist'), Richard Stallman, 2007/10/27
- Re: Risky variables in Gnus, Reiner Steib, 2007/10/27
- Re: Warning: `mapcar' called for effect; use `mapc' or `dolist', Richard Stallman, 2007/10/31
- Re: Warning: `mapcar' called for effect; use `mapc' or `dolist',
Reiner Steib <=
- Re: Warning: `mapcar' called for effect; use `mapc' or `dolist', Glenn Morris, 2007/10/31
- Re: Warning: `mapcar' called for effect; use `mapc' or `dolist', Katsumi Yamaoka, 2007/10/31
Re: Warning: `mapcar' called for effect; use `mapc' or `dolist', Reiner Steib, 2007/10/24