bug#19066: 25.0.50; nadvice and interactive-form

[Lars Ingebrigtsen]

Leo Liu <sdl.web@gmail.com> writes:

> 1. Start emacs and load a file with these lines:
>
>    (advice-add 'just-one-space :before #'change-interactive-form)
>    (defun change-interactive-form (&optional x y)
>      (interactive (list 1 1))
>      (princ (list x y)))
>
> M-x just-one-space prints (1 nil)
>
> 2. Start emacs and load a file with these lines:
>
>    (defun change-interactive-form (&optional x y)
>      (interactive (list 1 1))
>      (princ (list x y)))
>    (advice-add 'just-one-space :before #'change-interactive-form)
>
> M-x just-one-space errs: apply: Wrong number of arguments: (0 . 1), 2

So whether this works depends on whether `change-interactive-form' is
defined or not when `advice-add' is run?  (The only difference here is
the order.)

Perhaps Stefan has some insights here; added to the CCs.

-- 
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   bloggy blog: http://lars.ingebrigtsen.no