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problem with text properties whose names aren't symbols

From: Joe Corneli
Subject: problem with text properties whose names aren't symbols
Date: Sun, 11 Dec 2005 21:49:21 -0500 (EST)

>From the elisp manual (node: Text Properties):

   Each property has a name and a value.  Both of these
   can be any Lisp object, but the name is normally a symbol.

Well, it seems that when the Lisp object is not a symbol,
there is a problem.  This is illustrated by evaluating
the following form interactively:

  (put-text-property (point) (1+ (point)) 
                     '(example name)
  (put-text-property (point) (1+ (point)) 
                     '(example name)
  (text-properties-at (point)))

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
/Users/jcorneli/emacs/etc/DEBUG for instructions.

In GNU Emacs 22.0.50 (powerpc-apple-darwin7.2.0, X toolkit)
 of 2005-12-11 on Joseph-Cornelis-Computer.local
X server distributor `The XFree86 Project, Inc', version 11.0.40400000
configured using `configure '--without-carbon' '-with-x' '--with-jpeg''

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: nil
  default-enable-multibyte-characters: t

Major mode: Fundamental

Minor modes in effect:
  show-paren-mode: t
  tooltip-mode: t
  auto-compression-mode: t
  mouse-wheel-mode: t
  file-name-shadow-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
  transient-mark-mode: t

Recent input:
C-x C-f <M-backspace> e m <tab> - b <tab> <return> 
<down> <down> <down> <down> <down> <down> <down> <down> 
<down> <down> <down> <down> <down> <down> <C-right> 
C-x C-e C-SPC <C-left> M-w M-x r e p o r <tab> <re

Recent messages:
Loading joes_basic_bindings (source)...
Loading edmacro...done
Loading joes_basic_bindings (source)...done
Loading joes_special_bindings (source)...done
Loading joes_mail2 (source)...done
Loading joes_parens (source)...done
For information about the GNU Project and its goals, type C-h C-p.
((example name) nil (example name) t)
Mark set
Loading emacsbug...done

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