- Paper_column *le = dynamic_cast<Paper_column *> (unsmob_grob (scm_car (between)));
- Paper_column *re = dynamic_cast<Paper_column *> (unsmob_grob (scm_cdr (between)));
+ Paper_column *le = dynamic_cast<Paper_column *> (Grob::unsmob (scm_car (between)));
+ Paper_column *re = dynamic_cast<Paper_column *> (Grob::unsmob (scm_cdr (between)));