Hi Bernt,

thanks for chasing this down.  I tried to install emacs-23.2 but 
it does not compile on my machine.

Does this patch fixes the problem for you?

My guess is that (copy-marker nil t) returns an error on emacs-23.2.
It's a weird sexp anyway, make-marker and set-marker-insertion-type 
are cleaner IMO.

Thanks for testing,