On 07/25/2012 02:05 AM, Stefan Monnier wrote:

> I think you'll be better off making it into a standard Lisp_Object such
> as pseudovector or a Lisp_Misc.  The fact that they're only used on the
> specpdl and hence managed via xmalloc+xfree shouldn't make them
> that special.

OK. The only question is: should `excursion' field of struct buffer
be special, like `undo_list', or handled as usual? This patch assumes
first scenario, but it's not a problem to follow the second one.

Dmitry