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comment-region fails if comment-padding is nil


From: Jim Davidson
Subject: comment-region fails if comment-padding is nil
Date: 13 Nov 2001 11:21:54 -0800

This bug report will be sent to the Free Software Foundation,
not to your local site managers!
Please write in English, because the Emacs maintainers do not have
translators to read other languages for them.

Your bug report will be posted to the address@hidden mailing list,
and to the gnu.emacs.bug news group.

In GNU Emacs 21.1.1 (i386-msvc-nt4.0.1381)
 of 2001-10-22 on buffy
configured using `configure --with-msvc (12.00)'
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: nil

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

Set comment-padding to nil.

Do comment-region (e.g., in an elisp buffer).  This produces an error:

comment-region: Wrong type argument: arrayp, nil

The problem is an attempt to take a substring of nil.

nil is a valid value for comment-padding, according to the docstring
for the variable.  It worked in 20.7, but the comment code has been
rewritten since then.

Recent input:
C-a q u C-p c s A u C-k M-< C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-y 
C-p C-p C-p C-p C-p C-p C-n C-n C-n C-n A s C-p C-p 
C-n C-n M-: ( s e t q SPC c o m m e n t - p a d d i 
n g SPC n i l ) <return> C-x 4 b . e m <tab> <return> 
C-p C-SPC C-p C-SPC C-n C-x ; M-x r e p o r t SPC e 
m <tab> <return>

Recent messages:
Saving file d:/News/.ggtesrc.eld...
Wrote d:/News/.ggtesrc.eld
Saving d:/News/.ggtesrc.eld...done
Killed group gnu.emacs.bug
Mark set
nil
Mark set [2 times]
Loading newcomment...done
comment-region: Wrong type argument: arrayp, nil
Loading emacsbug...done




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