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bug#3662: Possible problem with ido-completing-read

From: Peter Milliken
Subject: bug#3662: Possible problem with ido-completing-read
Date: Wed, 24 Jun 2009 07:37:42 +1000

--text follows this line--

Please write in English if possible, because the Emacs maintainers
usually do not have translators to read other languages for them.

Your bug report will be posted to the address@hidden mailing list.

Please describe exactly what actions triggered the bug
and the precise symptoms of the bug:

This bug is also present in Emacs 22.3. I am attempting to use
ido-completing-read in a defun and the function "hangs" at the prompt
i.e. it does no completion at all, it will not allow me to cancel the
command, or accept a string typed in followed by RET.

I have produced a small test function to attempt to minimise possible
problems on my part:

(defun test ()
  (let ((a)(d)) 
    (setq d '("abc" "xyz" "abe" "def"))
    (setq a (ido-completing-read "prompt: " d))))

My *understanding* of reading the defun documentation is that I should
be able to type "a<TAB>" (at the prompt) and have a completion list of
"abc" and "abe" offered. But this does not happen, all I get is "a
TAB". If I hit C-g nothing happens, the prompt line remains at the
command line. I compiled the above with debug on and received the
following trace when I hit C-g:

Debugger entered--Lisp error: (quit)
  apply(debug error (quit))
  edebug(error (quit))
  signal(quit nil)
  edebug-signal(quit nil)
  signal(quit nil)
  call-interactively(keyboard-quit nil nil)
  completing-read("prompt: " (("dummy" . 1)) nil nil nil nil)
  byte-code("   \" lj\n  & " [item prompt ido-text-init history completing-read ido-make-prompt (("dummy" . 1)) nil] 7)
  ido-read-internal(list "prompt: " nil nil nil nil)
  ido-completing-read("prompt: " ("abc" "xyz" "abe" "def"))
  (edebug-after (edebug-before 4) 6 (ido-completing-read "prompt: " (edebug-after 0 5 d)))
  (setq a (edebug-after (edebug-before 4) 6 (ido-completing-read "prompt: " ...)))
  (edebug-after (edebug-before 3) 7 (setq a (edebug-after ... 6 ...)))
  (let ((a) (d)) (edebug-after (edebug-before 1) 2 (setq d ...)) (edebug-after (edebug-before 3) 7 (setq a ...)))
  (edebug-after (edebug-before 0) 8 (let (... ...) (edebug-after ... 2 ...) (edebug-after ... 7 ...)))
  (lambda nil (edebug-after (edebug-before 0) 8 (let ... ... ...)))()
  edebug-enter(test nil (lambda nil (edebug-after (edebug-before 0) 8 (let ... ... ...))))
  edebug-enter(test nil (lambda nil (edebug-after (edebug-before 0) 8 (let ... ... ...))))
  call-interactively(test t nil)
  call-interactively(execute-extended-command nil nil)

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
c:/emacs/etc/DEBUG for instructions.

In GNU Emacs (i386-mingw-nt5.1.2600)
 of 2009-06-20 on SOFT-MJASON
Windowing system distributor `Microsoft Corp.', version 5.1.2600
configured using `configure --with-gcc (3.4)'

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: ENA
  value of $XMODIFIERS: nil
  locale-coding-system: cp1252
  default-enable-multibyte-characters: t

Major mode: Emacs-Lisp

Minor modes in effect:
  show-paren-mode: t
  desktop-save-mode: t
  recentf-mode: t
  tooltip-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  global-auto-composition-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  column-number-mode: t
  line-number-mode: t

C-u <escape> C-x <escape> x t e s t <return> g a <tab> 
C-g <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <menu-bar> <help-menu> <se

Recent messages:
Local value of py-indent-offset set to 2
Using the CPython shell
Fill column set to 80 (was 70) [9 times]
Wrote c:/usr/local/.emacs.desktop.lock
Desktop: 51 buffers restored.
Loading c:/usr/local/.session...done
For information about GNU Emacs and the GNU system, type C-h C-a.
Edebug: test
Entering debugger...

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