Function importer::soundcast::trips::other_border

fn other_border(
    from: &Endpoint, 
    to: &Endpoint, 
    constraints: PathConstraints, 
    huge_map: &Map, 
    huge_osm_id_to_bldg: &HashMap<OsmID, BuildingID>, 
    map: &Map, 
    usable_borders: &[(IntersectionID, LonLat)]
) -> Option<IntersectionID>