Re: wrong-type-argument stringp nil

[Ikumi Keita]

Hi Tassilo,

>>>>> Tassilo Horn <tsdh@gnu.org> writes:
> Ok, I've pushed two commits to master, each one fixing one spot
> introducing duplicate entries.

> modified   latex.el
> @@ -6217,8 +6217,9 @@ function would return non-nil and `(match-string 1)' 
> would return
>                      (cons (concat "\\" (nth 0 x)) (nth 1 x)))
>                    LaTeX-section-list)))
 
> -  (set (make-local-variable 'TeX-auto-full-regexp-list)
> -       (append LaTeX-auto-regexp-list plain-TeX-auto-regexp-list))
> +  (setq-local TeX-auto-full-regexp-list
> +              (delete-dups (append LaTeX-auto-regexp-list
> +                                   plain-TeX-auto-regexp-list)))

As discussed previously[1], `delete-dups'+`append' can be dangerous as
they may truncate list variable inadvertently. Though I think this
particular case is unlikely to suffer from such truncation, I'd propse
to install the attached defensive code. What do you think about this?

Regards,
Ikumi Keita

[1]https://lists.gnu.org/archive/html/auctex-devel/2017-09/msg00010.html

0001-Prevent-inadvertent-destruction-of-list-variable.patch
Description: proposed fix