bug#24353: 25.1.1: looking-back wrong info

[Eli Zaretskii]

> From: Andreas Röhler <andreas.roehler@easy-emacs.de>
> Date: Fri, 2 Sep 2016 10:48:39 +0200
> 
> Wrong advertised-calling-convention
> 
>  From subr.el: looking-back declares optional argument LIMIT mandatory.
> 
> Such calling-convention deserves a place in doku, but should not send 
> wrong info out of didactics

Are you saying that using advertised-calling-convention is wrong
everywhere, or just in this one case?  If the latter, what is special
about this function?

Thanks.