bug#4183: 23.1.50; replace-string

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 [email protected] mailing list.

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

You can reproduce the bug by
M-x replace-string RET RET
Emacs takes up the CPU and has no response.

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
d:/Program Files/Emacs/etc/DEBUG for instructions.


In GNU Emacs 23.1.50.1 (i386-mingw-nt6.0.6001)
 of 2009-07-30 on BREPNB
Windowing system distributor `Microsoft Corp.', version 6.0.6001
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: CHS
  value of $XMODIFIERS: nil
  locale-coding-system: cp936
  default-enable-multibyte-characters: t

Major mode: Summary

Minor modes in effect:
  shell-dirtrack-mode: t
  jabber-activity-mode: t
  global-highlight-changes-mode: t
  highlight-changes-visible-mode: t
  yas/minor-mode: t
  diff-auto-refine-mode: t
  auto-image-file-mode: t
  show-paren-mode: t
  delete-selection-mode: t
  partial-completion-mode: t
  icomplete-mode: t
  tooltip-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
  transient-mark-mode: t
  abbrev-mode: t

Recent input:
<return> y C-x 1 <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <return> SPC <down> <down> SPC <down> SPC M-x 
e m a c s <tab> r e <tab> <backspace> <backspace> b 
u <tab> g <tab> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> b u <tab> g <tab> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> <backspace> <backspace> <backspace> 
<backspace> <backspace> r e p <tab> o <tab> r t <tab> 
b u <tab> <return>

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Load-path shadows:
d:/program/Maxima/share/maxima/5.18.1/emacs/setup-imaxima-imath hides d:/program/Emacs/addon/imaxima-imath/setup-imaxima-imath
d:/program/Maxima/share/maxima/5.18.1/emacs/imaxima hides d:/program/Emacs/addon/imaxima-imath/imaxima
d:/program/Maxima/share/maxima/5.18.1/emacs/imaxima-autoconf-variables hides d:/program/Emacs/addon/imaxima-imath/imaxima-autoconf-variables
d:/program/Maxima/share/maxima/5.18.1/emacs/imath hides d:/program/Emacs/addon/imaxima-imath/imath
d:/program/Emacs/addon/cedet/speedbar/speedbar hides d:/Program Files/Emacs/lisp/speedbar
d:/program/Emacs/addon/cedet/speedbar/sb-image hides d:/Program Files/Emacs/lisp/sb-image
d:/program/Emacs/addon/ps-print/ps-samp hides d:/Program Files/Emacs/lisp/ps-samp
d:/program/Emacs/addon/ps-print/ps-print hides d:/Program Files/Emacs/lisp/ps-print
d:/program/Emacs/addon/ps-print/ps-mule hides d:/Program Files/Emacs/lisp/ps-mule
d:/program/Emacs/addon/ps-print/ps-def hides d:/Program Files/Emacs/lisp/ps-def
d:/program/Emacs/addon/ps-print/ps-bdf hides d:/Program Files/Emacs/lisp/ps-bdf
d:/program/Emacs/addon/g-client/json hides d:/Program Files/Emacs/lisp/json
d:/program/Emacs/addon/cedet/common/ezimage hides d:/Program Files/Emacs/lisp/ezimage
d:/program/Emacs/addon/cedet/speedbar/dframe hides d:/Program Files/Emacs/lisp/dframe
d:/program/Emacs/addon/emms/tq hides d:/Program Files/Emacs/lisp/emacs-lisp/tq
d:/program/Emacs/addon/predictive/avl-tree hides d:/Program Files/Emacs/lisp/emacs-lisp/avl-tree
d:/Program Files/Emacs/site-lisp/nnir hides d:/Program Files/Emacs/lisp/gnus/nnir
d:/program/Emacs/addon/newsticker/newsticker hides d:/Program Files/Emacs/lisp/net/newsticker
d:/program/Emacs/addon/newsticker/newst-treeview hides d:/Program Files/Emacs/lisp/net/newst-treeview
d:/program/Emacs/addon/newsticker/newst-ticker hides d:/Program Files/Emacs/lisp/net/newst-ticker
d:/program/Emacs/addon/newsticker/newst-reader hides d:/Program Files/Emacs/lisp/net/newst-reader
d:/program/Emacs/addon/newsticker/newst-plainview hides d:/Program Files/Emacs/lisp/net/newst-plainview
d:/program/Emacs/addon/newsticker/newst-backend hides d:/Program Files/Emacs/lisp/net/newst-backend
d:/Program Files/Emacs/site-lisp/js2-mode hides d:/Program Files/Emacs/lisp/progmodes/js2-mode
d:/Program Files/Emacs/site-lisp/flymake hides d:/Program Files/Emacs/lisp/progmodes/flymake
d:/program/Emacs/addon/remember/remember hides d:/Program Files/Emacs/lisp/textmodes/remember
d:/Program Files/Emacs/site-lisp/flyspell hides d:/Program Files/Emacs/lisp/textmodes/flyspell