void substitute_one_mutable_property (SCM sym, SCM val);
bool fast_substitute_grob_array (SCM sym, Grob_array *);
- virtual Interval_t<int> spanned_rank_iv ();
+ // TODO: make virtual and do this for Items as well.
+ Interval_t<int> spanned_rank_iv ();
void set_bound (Direction d, Grob *);
Item *get_bound (Direction d) const;