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Problem with elisp highilghting/parsing code.


From: Velizar Bodurski
Subject: Problem with elisp highilghting/parsing code.
Date: 18 Aug 2004 21:03:01 +0300
User-agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3

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In GNU Emacs 21.3.1 (i386-msvc-nt5.1.2600)
 of 2003-03-26 on TJUMP20
configured using `configure --with-msvc (13.00)'
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: ENU
  locale-coding-system: iso-latin-1
  default-enable-multibyte-characters: t

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

The example code is:
(defun just-a-test ()
  "this is a test
(code)"
  (interactive)
  (progn
    (message "hello")))

in the above code highlighting and auto-indent does not work,
i.e. copy that code into *scratch* buffer and try editing the code,
for example delete 'progn' and then write 'prog1' in its place,
what I see is that prog1 is highlighted as a string. The source of
this problem seems to be the '(code)' in function's help string, if
for example single space is added at the line's beginning before
'(code)', highlighting/autoindent is OK, or if the '(code)' is
moved on the same line as 'this is just a test' string then again
autoindent/highlighting is OK. But when there is string with openning
brace at the line's beginning (which is actually within a string)
parsing lisp does not work correctly (even C-M-x does not recognize
the above code as a valid form and skips it in its search for valid
form to evaluate).
(Regarding platforms on which the problem is seen, initially this
problem was found on Linux with Emacs 21.3.1.

Also reproduced the same problem with 'emacs -q --no-init-file'.

Recent input:
c s - d e v e l SPC <backspace> @ b a <backspace> <backspace> 
g n u . o r g C-x 4 b <return> L C-r e m a c s <return> 
<return> <return> q C-x b <return> C-n P r o b l e 
m SPC w i t h SPC e l i s p SPC h i g h l i g h t i 
n g SPC c o d e . C-x C-s C-c C-k l <language-change> 
M-x <language-change> r e p o SPC r t SPC b SPC <backspace> 
SPC SPC <return>

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