Re: 23.0.60; M-x compile gives args out of range 0, 0

[Alan Mackenzie]

Hi, everybody!

On Tue, Apr 08, 2008 at 11:03:02AM -0400, Stefan Monnier wrote:
> > When doing M-x compile I get:
> > font-lock-extend-region-multiline: Args out of range: 0, 0
> 
> Does the patch below make it disappear, by any chance?
> 
> 
>         Stefan
> 
> 
> === modified file 'lisp/progmodes/cc-mode.el'
> --- lisp/progmodes/cc-mode.el 2008-04-07 16:37:22 +0000
> +++ lisp/progmodes/cc-mode.el 2008-04-08 15:01:47 +0000

With respect, that's the wrong place to patch.  It is liable to catch
out anybody else who uses font-lock-extend-after-change-region-function
in the future.  This variable should be made buffer-local once and for
all, like this:


Index: font-lock.el
===================================================================
RCS file: /cvsroot/emacs/emacs/lisp/font-lock.el,v
retrieving revision 1.333
diff -c -r1.333 font-lock.el
*** font-lock.el        14 Mar 2008 16:15:47 -0000      1.333
--- font-lock.el        8 Apr 2008 17:01:34 -0000
***************
*** 996,1002 ****
  (defvar font-lock-extend-after-change-region-function nil
    "A function that determines the region to refontify after a change.
  
! This variable is either nil, or is a function that determines the
  region to refontify after a change.
  It is usually set by the major mode via `font-lock-defaults'.
  Font-lock calls this function after each buffer change.
--- 996,1002 ----
  (defvar font-lock-extend-after-change-region-function nil
    "A function that determines the region to refontify after a change.
  
! This buffer-local variable is either nil, or is a function that determines the
  region to refontify after a change.
  It is usually set by the major mode via `font-lock-defaults'.
  Font-lock calls this function after each buffer change.
***************
*** 1007,1012 ****
--- 1007,1013 ----
  \(which directs the caller to fontify a default region).
  This function should preserve the match-data.
  The region it returns may start or end in the middle of a line.")
+ (make-variable-buffer-local 'font-lock-extend-after-change-region-function)
  
  (defun font-lock-fontify-buffer ()
    "Fontify the current buffer the way the function `font-lock-mode' would."


-- 
Alan Mackenzie (Nuremberg, Germany).