[Bug-AUCTeX] 11.87; Wrong face for texinfo's "@c" comments

[Samuel Bronson]

I'm rather surprised that your version of `texinfo-mode' doesn't fontify
the "@c" (comment) command in the usual manner.

Maybe something changed in one of the parts re-used from texinfo.el?

It still works in emacs23:

GNU Emacs 23.4.1 (i486-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2013-12-22 on biber, modified by Debian

But fails in emacs24:

GNU Emacs 24.3.1 (i486-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2014-05-16 on babin, modified by Debian

In any case, I note that in emacs23, I have
`font-lock-syntactic-keywords' of:

(t
 (("\\(@\\)c\\(omment\\)?\\>" (1 "<"))
  ("^\\(@\\)ignore\\>"        (1 "< b"))
  ("address@hidden ignore\\(\n\\)"     (1 "> b")))
 ("\\(@\\)c\\(omment\\)?\\>" (1 "<"))
 ("^\\(@\\)ignore\\>"        (1 "< b"))
 ("address@hidden ignore\\(\n\\)"     (1 "> b")))

But in emacs24, it's just nil (and deprecated).

This is presumably somehow related

Emacs  : GNU Emacs 24.3.1 (i486-pc-linux-gnu, X toolkit, Xaw3d scroll bars)
 of 2014-05-16 on babin, modified by Debian
Package: 11.87

current state:
==============
(setq
 AUCTeX-date "2012-11-30"
 window-system 'x
 LaTeX-version "2e"
 TeX-style-path '("/var/lib/auctex/emacs24/"
                  "/usr/share/emacs/site-lisp/auctex/style"
                  "/home/naesten/.emacs.d/auctex/auto"
                  "/home/naesten/.emacs.d/auctex/style" "auto" "style")
 TeX-auto-save nil
 TeX-parse-self nil
 TeX-master t
 TeX-command-list '(("TeX" "%(PDF)%(tex) %`%S%(PDFout)%(mode)%' %t"
                     TeX-run-TeX nil
                     (plain-tex-mode ams-tex-mode texinfo-mode) :help
                     "Run plain TeX")
                    ("LaTeX" "%`%l%(mode)%' %t" TeX-run-TeX nil
                     (latex-mode doctex-mode) :help "Run LaTeX")
                    ("Makeinfo" "makeinfo %t" TeX-run-compile nil
                     (texinfo-mode) :help "Run Makeinfo with Info output")
                    ("Makeinfo HTML" "makeinfo --html %t" TeX-run-compile nil
                     (texinfo-mode) :help "Run Makeinfo with HTML output")
                    ("AmSTeX" "%(PDF)amstex %`%S%(PDFout)%(mode)%' %t"
                     TeX-run-TeX nil (ams-tex-mode) :help "Run AMSTeX")
                    ("ConTeXt" "texexec --once --texutil %(execopts)%t"
                     TeX-run-TeX nil (context-mode) :help "Run ConTeXt once")
                    ("ConTeXt Full" "texexec %(execopts)%t" TeX-run-TeX nil
                     (context-mode) :help "Run ConTeXt until completion")
                    ("BibTeX" "bibtex %s" TeX-run-BibTeX nil t :help
                     "Run BibTeX")
                    ("Biber" "biber %s" TeX-run-Biber nil t :help "Run Biber")
                    ("View" "%V" TeX-run-discard-or-function t t :help
                     "Run Viewer")
                    ("Print" "%p" TeX-run-command t t :help "Print the file")
                    ("Queue" "%q" TeX-run-background nil t :help
                     "View the printer queue" :visible TeX-queue-command)
                    ("File" "%(o?)dvips %d -o %f " TeX-run-command t t :help
                     "Generate PostScript file")
                    ("Index" "makeindex %s" TeX-run-command nil t :help
                     "Create index file")
                    ("Check" "lacheck %s" TeX-run-compile nil (latex-mode)
                     :help "Check LaTeX file for correctness")
                    ("Spell" "(TeX-ispell-document \"\")" TeX-run-function nil
                     t :help "Spell-check the document")
                    ("Clean" "TeX-clean" TeX-run-function nil t :help
                     "Delete generated intermediate files")
                    ("Clean All" "(TeX-clean t)" TeX-run-function nil t :help
                     "Delete generated intermediate and output files")
                    ("Other" "" TeX-run-command t t :help
                     "Run an arbitrary command")
                    )
 )
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