bug#33227: 25.1; auctex: tex.el: TeX-local-master-p does not check if complete local variable block is valid

[Glenn Morris]

Since this seems to be an AUCTeX issue, I have reassigned it to auctex.

Jan Luca Naumann wrote:

> Dear emacs- and auctex-maintainers,
>
> if the local variable block is not valid (for example due to a typo in
> "Local Variables") the function TeX-local-master-p will create the wrong
> result that TeX-master is set locally although it is not read from the
> variables block. Maybe the heuristic in TeX-local-master-p should be
> improved if the local variables are loaded correctly, otherwise the
> complete process will fail for example in TeX-master-file-ask with the
> error "Master file already set".
>
> Thank you for your help and best regards,
> Jan
>
> In GNU Emacs 25.1.1 (x86_64-pc-linux-gnu, GTK+ Version 3.22.11)
>  of 2017-09-15, modified by Debian built on trouble
> Windowing system distributor 'The X.Org Foundation', version 11.0.11902000
> System Description:   Debian GNU/Linux 9.5 (stretch)
>
> Configured using:
>  'configure --build x86_64-linux-gnu --prefix=/usr
>  --sharedstatedir=/var/lib --libexecdir=/usr/lib
>  --localstatedir=/var/lib --infodir=/usr/share/info
>  --mandir=/usr/share/man --with-pop=yes
>  
> --enable-locallisppath=/etc/emacs25:/etc/emacs:/usr/local/share/emacs/25.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/25.1/site-lisp:/usr/share/emacs/site-lisp
>  --with-sound=alsa --build x86_64-linux-gnu --prefix=/usr
>  --sharedstatedir=/var/lib --libexecdir=/usr/lib
>  --localstatedir=/var/lib --infodir=/usr/share/info
>  --mandir=/usr/share/man --with-pop=yes
>  
> --enable-locallisppath=/etc/emacs25:/etc/emacs:/usr/local/share/emacs/25.1/site-lisp:/usr/local/share/emacs/site-lisp:/usr/share/emacs/25.1/site-lisp:/usr/share/emacs/site-lisp
>  --with-sound=alsa --with-x=yes --with-x-toolkit=gtk3
>  --with-toolkit-scroll-bars 'CFLAGS=-g -O2
>  -fdebug-prefix-map=/build/emacs25-wN2qS3/emacs25-25.1+1=.
> -fstack-protector-strong
>  -Wformat -Werror=format-security -Wall' 'CPPFLAGS=-Wdate-time
>  -D_FORTIFY_SOURCE=2' LDFLAGS=-Wl,-z,relro'
>
> Configured features:
> XPM JPEG TIFF GIF PNG RSVG IMAGEMAGICK SOUND GPM DBUS GCONF GSETTINGS
> NOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE M17N_FLT LIBOTF XFT ZLIB
> TOOLKIT_SCROLL_BARS GTK3 X11
>
> Important settings:
>   value of $LC_ALL: de_DE.utf-8
>   value of $LANG: de_DE.utf-8
>   locale-coding-system: utf-8
>
> Major mode: Emacs-Lisp
>
> Minor modes in effect:
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>   fci-mode: t
>   rainbow-delimiters-mode: t
>   flyspell-mode: t
>   ws-butler-mode: t
>   which-key-mode: t
>   csv-field-index-mode: t
>   yas-global-mode: t
>   yas-minor-mode: t
>   ivy-mode: t
>   TeX-PDF-mode: t
>   global-magit-file-mode: t
>   magit-file-mode: t
>   diff-auto-refine-mode: t
>   magit-auto-revert-mode: t
>   global-git-commit-mode: t
>   async-bytecomp-package-mode: t
>   shell-dirtrack-mode: t
>   global-undo-tree-mode: t
>   undo-tree-mode: t
>   override-global-mode: t
>   electric-pair-mode: t
>   show-paren-mode: t
>   delete-selection-mode: t
>   tooltip-mode: t
>   global-eldoc-mode: t
>   electric-indent-mode: t
>   mouse-wheel-mode: t
>   tool-bar-mode: t
>   menu-bar-mode: t
>   file-name-shadow-mode: t
>   global-font-lock-mode: t
>   font-lock-mode: t
>   auto-composition-mode: t
>   auto-encryption-mode: t
>   auto-compression-mode: t
>   column-number-mode: t
>   line-number-mode: t
>   auto-fill-function: yas--auto-fill
>   transient-mark-mode: t
>
> Recent messages:
> Applying style hooks...done
> mwheel-scroll: End of buffer [5 times]
> Auto-saving...done
> Auto-saving...done
> Compiling label environment definitions...done
> ref: info not available, use 'M-x reftex-view-crossref' to get it.
> Quit [2 times]
> C-x C-g is undefined
> Quit
> Mark saved where search started
>
> Load-path shadows:
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> /usr/share/emacs25/site-lisp/emacs-goodies-el/csv-mode
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> /home/janluca/.emacs.d/elpa/let-alist-1.0.5/let-alist hides
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>
> Features:
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