bug#42590: Fwd: bug#42590: 27.0.91; Advice error for interactive commands

[Yuan Fu]

Begin forwarded message:

From: Yuan Fu <casouri@gmail.com>

Subject: Re: bug#42590: 27.0.91; Advice error for interactive commands

Date: July 29, 2020 at 3:21:52 PM GMT-4

To: Michael Heerdegen <michael_heerdegen@web.de>

Cc: 42590@debbugs.gnu.org

On Jul 29, 2020, at 1:41 PM, Michael Heerdegen <michael_heerdegen@web.de> wrote:

Yuan Fu <casouri@gmail.com> writes:

To reproduce the issue, evaluate

(advice-add 'backward-delete-char-untabify :after 'ignore)

and hit backspace (which should call backward-delete-char-untabify), and
an error occurs: apply: Wrong number of arguments: (1 . 2), 0

Had to think about it.  But it's expected I think: `ignore' is
interactive, and as documented, its interactive spec overwrites the
interactive spec of the original function.  And it doesn't fit.

So everything behaves as documented, it's your specified after advice
that causes the problem.  Right?

Michael.

Thanks. I first advised with another interactive function and found this problem. Ignore is just an example. Once I remove the advice the problem went away. I’ll close this report now.

Yuan