bug#72999: 29.4; fill-paragraph error in latex mode

[Arash Esbati <arash@gnu.org>]

Vadim Zaliva <lord@crocodile.org> writes:

> If I have buffer like this:
>
> Foo \cite{bar} bar.
>
> And press `M-q` I get error:
>
> LaTeX-indent-calculate-last: Wrong type argument: stringp, nil
> [...]
> Major mode: LaTeX

It seems you're running AUCTeX as major-mode and not the builtin one.
Which version of AUCTeX are you using and how did you install it?

At any rate, I can't reproduce what you describe with this small file:

--8<---------------cut here---------------start------------->8---
\documentclass{article}

\begin{document}

Foo \cite{bar} bar.! Point here hitting M-q

\end{document}

%%% Local Variables:
%%% mode: LaTeX
%%% TeX-master: t
%%% End:
--8<---------------cut here---------------end--------------->8---

Can you come up with a recipe to reproduce with:

• Start Emacs with 'emacs -Q'
• Activate AUCTeX by eval'ing this in scratch (presuming you've
  installed AUCTeX from ELPA):
    (progn
      (setq debug-on-error t)
      (package-initialize t)
      (package-activate 'auctex))
• In the file above (or any other example), tell us exactly where to put
  the cursor before hitting 'M-q'
• Show what the debugger says in your case.

Best, Arash