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

["Herbert Euler" <herberteuler@hotmail.com>]

In the newest unicode 2 branch, `parse-sexp-lookup-properties' is
default to `t' in C++ mode but not in C mode.  I don't have the
Emacs 22 trunk, and so don't know the case in that trunk.  But
if this variable is set to t by default, there will be a bug in c++-mode:

1. Visit an empty, new C++ file.
2. Try to insert the following line, at the beginning of the buffer:

#include <iostream>

Well, an error will be signaled when typing the second character, "i",
says "Point before start of properties".  This error happens in the
function `c-beginning-of-current-token', when invoking
`skip-syntax-backward':

(defun c-beginning-of-current-token (&optional back-limit)
  ;; Move to the beginning of the current token.  Do not move if not
  ;; in the middle of one.  BACK-LIMIT may be used to bound the
  ;; backward search; if given it's assumed to be at the boundary
  ;; between two tokens.  Return non-nil if the point is move, nil
  ;; otherwise.
  ;;
  ;; This function might do hidden buffer changes.
    (let ((start (point)))
      (if (looking-at "\\w\\|\\s_")
          (skip-syntax-backward "w_" back-limit)
	(when (< (skip-syntax-backward ".()" back-limit) 0)
  ;; ... ...

If `parse-sexp-lookup-properties' is t, `skip-syntax-backward' would
not return -1, but signaling an error in some cases.

Regards,
Guanpeng Xu

_________________________________________________________________
Express yourself instantly with MSN Messenger! Download today it's FREE! 
http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/