Re: master b2416d2c029 4/6: Don't load comp when installing an existing trampoline

[Stefan Monnier <monnier@iro.umontreal.ca>]

Hi Andrea,

> --- a/lisp/emacs-lisp/nadvice.el
> +++ b/lisp/emacs-lisp/nadvice.el
> @@ -389,7 +389,7 @@ is also interactive.  There are 3 cases:
>    `(advice--add-function ,how (gv-ref ,(advice--normalize-place place))
>                           ,function ,props))
>  
> -(declare-function comp-subr-trampoline-install "comp")
> +(declare-function comp-subr-trampoline-install "comp-run")
>  
>  ;;;###autoload
>  (defun advice--add-function (how ref function props)
> @@ -407,7 +407,7 @@ is also interactive.  There are 3 cases:
>        (unless (memq subr-name '(macroexpand rename-buffer))
>          ;; Must require explicitly as during bootstrap we have no
>          ;; autoloads.
> -        (require 'comp)
> +        (require 'comp-run)
>          (comp-subr-trampoline-install subr-name))))

2 things:

- The `declare-function` should be moved to right after (require
  'comp-run), i.e. when we do know that the function should be available
  and it will thus silence only spurious warnings.
- Why do we do that in `advice--add-function`, which is used by
  `advice-add` indeed but also by `add-function`, e.g. when adding
  a function to a `foo-function`variable or to a process filter,
  where there's no trampoline to install.
- Why do we need this at all?
  Won't `Ffset` call `comp-subr-trampoline-install` for us anyway.


        Stefan