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

[Alan Mackenzie <acm@muc.de>]

Hi, Guanpeng!

On Sat, May 12, 2007 at 06:39:12PM +0800, Herbert Euler wrote:
> 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:

parse-sexp-lookup-properties is t in C++ Mode so that text properties
can be set on pertinent <s and >s (in templates) to mark them as
parentheses.

> 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':

OK.  This doesn't happen to me in the Emacs 22 release branch.  But
c-beginning-of-current-token was changed recently.  I suspect you might
have some option set which exposes a bug in that function.

Did you start your emacs with -Q?  If not does the error still happen
when you do?  If you didn't use -Q, could you please dump your CC Mode
configuration with C-c C-b and post it here.

[ .... ]

> Regards,
> Guanpeng Xu

-- 
Alan Mackenzie (Ittersbach, Germany).