edebug args-out-of-range error

[Stephen Berman]

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


Edebug throws an args-out-of-range error on instrumented functions
that call search-backward, when the search goal is at buffer position
256 or higher.  To reproduce:

1. emacs -q -no-site-file
2. In *scratch* type
   (defun test-edebug ()
      (interactive)
      (search-backward "test"))
   and instrument it (C-u C-M-x)
3. Switch to an empty buffer, e.g. C-x b test
4. Type this: ESC 255 <SPACE> test
5. Type M-x test-edebug and then type <SPACE> to step into the
instrumented function.  This immediately yields the error: "Args out
of range: #^[t nil 0 1 2 3 4 5 6 7 8 9 10 11 12 ... nil case-table nil
nil nil]], 256", where '...' stands for a gigantic sequence of further
numbers and vectors of numbers and nils, etc (> 120 KB long).

There is no error if the search goal is at a buffer position lower
than 256 (e.g. typing 254 at step 4 above), and the error occurs if it
is at any higher position.


In GNU Emacs 22.0.50.9 (i686-pc-linux-gnu, GTK+ Version 2.6.4)
 of 2005-05-17 on escher
Distributor `The X.Org Foundation', version 11.0.60802000
configured using `configure '--with-x-toolkit=gtk''

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: en_US.UTF-8
  locale-coding-system: utf-8
  default-enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  eldoc-mode: t
  tabbar-mode: t
  recentf-mode: t
  show-paren-mode: t
  display-time-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  tooltip-mode: t
  auto-compression-mode: t
  menu-bar-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  column-number-mode: t
  line-number-mode: t
  next-error-follow-minor-mode:  Fol

Recent input:
<help-echo> <help-echo> <help-echo> <help-echo> <select-window> 
<help-echo> <select-window> <help-echo> <select-window> 
<help-echo> <select-window> <select-window> <help-echo> 
<down-mouse-2> <mouse-2> <help-echo> <help-echo> <help-echo> 
<help-echo> <help-echo> <help-echo> <help-echo> <help-echo> 
<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> <about> <help-echo> 
<help-echo> <down-mouse-1> <mouse-movement> <mouse-movement> 
<mouse-1> M-x r e p o <tab> r <tab> <return>

Recent messages:
Fontifying *Fancy Diary Entries*... (regexps..........)
Package lazy-lock is obsolete
Loading eldoc...done
Loading edmacro...done
Loading semantic-el...done
For information about the GNU Project and its goals, type C-h C-p.
Fontifying *scratch*... (regexps...............)
For information about the GNU Project and its goals, type C-h C-p.
Making completion list...
Loading emacsbug...done