bug#19711: 25.0.50; (ad-is-adviced sym) is inconsistent with (advice--p (advice--symbol-function sym))

[Stefan Monnier]

> I'm mainly interested in this application:

>     (help-function-arglist
>      (if (ad-is-advised fun)
>          (ad-get-orig-definition fun)
>        fun)
>      t)

Ah, I think this is just a bug of help-function-arglist: it should
automatically peel off any advice and look for the arglist of the
unadvised function instead.

> If `ad-is-advised` isn't enough, what other (public) function could I use?

Good question.  I think currently all the functions that could help come
with a "--".


        Stefan