Re: Advice functions: required args that byte-compiler warns are unused

[Stefan Monnier via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>]

>  (defun my-foo-after-advice (&rest args)
>    "..."
>    (ignore args)      ; Quiet the byte-compiler.
>    (do-stuff-that-doesnt-refer-to-ARGS))

Use 

    (defun my-foo-after-advice (&rest _args)

or just

    (defun my-foo-after-advice (&rest _)

> Suppose function `foo' requires 3 arguments:
>
>  (defun foo (a b c) ...)

Here you can use

    (defun foo (_a _b _c) ...)

tho you can also use

    (defun foo (&rest _) ...)

since you advice doesn't have to only accept exactly the same args as
the function it advises: it is free to accept *more* use-cases (and it's
often a good idea to do so, in case the advised function grows some
&optional arguments in the future).


        Stefan