static Drul_array< Link_array <Grob> > get_clash_groups (Grob *me);
DECLARE_SCHEME_CALLBACK (force_shift_callback, (SCM element, SCM axis));
static void do_shifts (Grob*);
static Drul_array< Link_array <Grob> > get_clash_groups (Grob *me);
DECLARE_SCHEME_CALLBACK (force_shift_callback, (SCM element, SCM axis));
static void do_shifts (Grob*);