hb_ot_layout_language_get_required_feature_index

function hb_ot_layout_language_get_required_feature_index(

  face: Phb_face_t;

  table_tag: Thb_tag_t;

  script_index: guint;

  language_index: guint;

  feature_index: Pguint

):Thb_bool_t;