Re: Warning: `mapcar' called for effect; use `mapc' or `dolist'

[Miles Bader]

Richard Stallman <address@hidden> 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