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TAB TAB completion fails after loading AUCTeX

From: Mark Dickinson
Subject: TAB TAB completion fails after loading AUCTeX
Date: Fri, 30 Dec 2005 15:50:08 -0500

Here's a bug report that I submitted earlier today to the AUCTeX
buglist.  Ralf Angeli helpfully suggested that this could be a
(Mac-specific) emacs bug that's triggered by AUCTeX, so I'm posting it
here.  Please let me know if I can answer any further questions.


I'm having a problem with Emacs and AUCTeX 11.82 running on
OS X 10.3.9.  The usual emacs minibuffer tab-completion seems to fail
on my system after AUCTeX is loaded.  The sequence of events is as

1. Launch emacs from a Terminal prompt.  At this stage tab-completion
   works as expected; that is, C-x C-f TAB TAB opens a new buffer
   showing the files in the current directory.

1.5 (Optionally) Carry out various non-TeX activities within Emacs.
   C-x C-f TAB TAB continues to work as expected.

2. Load the tex file test.tex (shown below) using C-x C-f test.tex.

3. Now on typing C-x C-f TAB TAB the message `Making completion
   list...' appears, and then nothing happens: after a second or so
   the minibuffer returns to the `Find file: ' prompt.  The *Messages*
   buffer then shows the error:

   run-hooks: Wrong type argument: stringp, #<objfwd to t>

After doing M-x toggle-debug-on-error and trying C-x C-f TAB TAB
again, I get the following *Backtrace*:

Debugger entered--Lisp error: (error "Apparently circular structure
being printed")
  read-file-name("Find file: " nil "~/" nil)
  find-file-read-args("Find file: " nil)

More details that may or may not be useful:

I'm running a newly installed version of Emacs (from cvs, 29
Dec, via the darwinports command `port install emacs-devel') together
with AUCTeX 11.82, on Mac OS X version 10.3.9.  However, I've been
having the same problem with older CVS versions of both emacs 22
(installed at various times this over the past month) and also with
version 11.55 of AUCTeX.  The problem seems to occur with and without
the carbon variant of emacs.

Single tab completion (C-x C-f TAB) still works fine, and AUCTeX and
preview-latex show no major problems.  In particular, tab-completion
for TeX commands works as expected.  Other double-tab completion in
Emacs (e.g. C-x b TAB TAB, etc.) seems to fail in the same way as

It doesn't seem to matter which TeX file I load.  The file `test.tex'
that I referred to above just contains the following 7 lines:


Just testing.

###End test.tex###

Following the suggestion in Appendix C of the AUCTeX manual, I tried
launching emacs with emacs -q -no-site-file and then loading
auctex.el; the problem still occurs.

Any ideas what might be going wrong here?  Please let me know if
I can provide any more information that might be useful.


Emacs  : GNU Emacs (powerpc-apple-darwin7.9.0)
 of 2005-12-29 on fibonacci
Package: 11.82

current state:
 AUCTeX-date "2005-12-17"
 window-system nil
 LaTeX-version "2e"
 TeX-style-path '("style" "auto"
 TeX-auto-save nil
 TeX-parse-self nil
 TeX-master t
 TeX-command-list '(("TeX" "%(PDF)%(tex) %S%(PDFout) \"%(mode)\\input
%t\"" TeX-run-TeX nil (plain-tex-mode ams-tex-mode texinfo-mode)
                     :help "Run plain TeX")
                    ("LaTeX" "%l \"%(mode)\\input{%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
                    ("AmSTeX" "%(PDF)amstex %S%(PDFout)
\"%(mode)\\input %t\"" TeX-run-TeX nil (ams-tex-mode) :help "Run
                    ("ConTeXt" "texexec --once --texutil
%(execopts)%t" TeX-run-TeX nil (context-mode) :help "Run ConTeXt
                    ("ConTeXt Full" "texexec %(execopts)%t"
TeX-run-TeX nil (context-mode) :help "Run ConTeXt until completion")
                    ("ConTeXt Clean" "texutil --purgeall"
TeX-run-interactive nil (context-mode) :help "Clean temporary ConTeXt
                    ("BibTeX" "bibtex %s" TeX-run-BibTeX nil t :help
"Run BibTeX")
                    ("View" "dvi2tty -q -w 132 %s" TeX-run-command t t
:help "Run Text 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" "<ignored>" TeX-run-ispell-on-document
nil t :help "Spell-check the document")
                    ("Other" "" TeX-run-command t t :help "Run an
arbitrary command"))

If emacs crashed, and you have the emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
If you would like to further debug the crash, please read the file
/opt/local/share/emacs/22.0.50/etc/DEBUG for instructions.

In GNU Emacs (powerpc-apple-darwin7.9.0)
 of 2005-12-29 on fibonacci
X server distributor `Apple Computers', version 10.3.9
configured using `configure '--prefix=/opt/local' '--without-x'
'CFLAGS=-I/opt/local/include' 'CPPFLAGS=-I/opt/local/include'

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: nil
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t

Major mode: PDFLaTeX

Minor modes in effect:
  TeX-PDF-mode: t
  encoded-kbd-mode: t
  auto-compression-mode: t
  menu-bar-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  line-number-mode: t

Recent input:

Recent messages:
Loading font-latex...done
Applying style hooks... done
Sorting environment...
Removing duplicates... done
Loading preview...
Loading byte-opt...done
Loading image...done
Loading preview...done
Applying style hooks... done
Loading emacsbug...done

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