Re: C++ mode and c-beginning-of-current-token

[martin rudalics <rudalics@gmx.at>]

 > Can I ask a silly question, too?  There are two "calling"s of
 > UPDATE_SYNTAX_TABLE_BACKWARD in `skip_chars', one with the "argument"
 > (pos), the other with (pos - 1).  To me, the second one does not look
 > like a typo, but a correct piece of code on purpose.  Yes, changing it
 >
 >> from (pos - 1) to (pos) works, but it seems to be dangerous to me.

I do have my own problems with UPDATE_SYNTAX_TABLE_BACKWARD.  To
reproduce with Emacs -Q define foo as

(defun foo ()
   (interactive)
   (put-text-property (1- (point)) (point) 'syntax-table '(2))
   (setq parse-sexp-lookup-properties t))

open a text-mode buffer, insert a couple of non-word chars in the
buffer, leave point after them, and type M-x foo followed by M-b.  On my
system it goes back by _two_ characters instead of one.  I'm yet too
silly to understand what's going on.