[Bug-AUCTeX] 11.84; texinfo mode provided by AUCTeX is not activated.

[Ikumi Keita]

Remember to cover the basics, that is, what you expected to happen and
what in fact did happen.

Be sure to consult the FAQ section in the manual before submitting
a bug report.  If the bug (or problem) is triggered by a specific
(La)TeX file, you should try to produce a minimal sample file
showing the problem and include it in your report.

Your bug report will be posted to the AUCTeX bug reporting list.
------------------------------------------------------------------------

When entering texinfo-mode, the one provided by AUCTeX is not
used.  Instead the original texinfo-mode bundled with emacs is used.

How to reproduce:
1. Create a new buffer with, say, C-x b aaa RET (The buffer name is
   arbitrary.)
2. M-x texinfo-mode
3. The buffer is in texinfo-mode provided with the original emacs, not
   in the one which comes along with AUCTeX.  One can tell the
   difference from, for example, by typing C-h b and observing that the
   *Help* buffer contains lines like
 C-c C-c c      address@hidden
   which contradics to that C-c C-c is bound to TeX-command-master in
   AUCTeX.

Analysis:
1. At first, tex-site.el declares the following defalias and autoload:
(defalias 'texinfo-mode 'TeX-texinfo-mode)
(autoload 'TeX-texinfo-mode "tex-info")
2. So typing M-x texinfo-mode leads to loading tex-info.el, which
   contains a form
(require 'texinfo)
3. Then texinfo.el, bundled with emacs, is loaded, resulting in that the
   above defalias for texinfo-mode is overwritten by
(define-derived-mode texinfo-mode text-mode "Texinfo"
   in texinfo.el.
4. Therefore, the overwritten function definition is used for M-x
   texinfo-mode, ignoring the TeX-texinfo-mode defined in tex-info.el.

Emacs  : GNU Emacs 21.4.1 (i386-unknown-freebsd4.11, X toolkit, Xaw3d scroll 
bars, emcws)
 of 2005-03-02 on myname.my.domain
Package: 11.84

current state:
==============
(setq
 AUCTeX-date "2007-01-12"
 window-system 'x
 LaTeX-version "2e"
 TeX-style-path '("style" "auto" "/home/keita/tex/style"
                  "/home/keita/tex/auto"
                  "/usr/local/share/emacs/site-lisp/auctex/style"
                  "/usr/local/var/auctex")
 TeX-auto-save nil
 TeX-parse-self t
 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")
                    ("View" "%V" TeX-run-discard 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")
                    )
 )