let mut journey = spacemission::new("galaxy exploration"); for planet in journey.planets.preexpansion_list() { journey.update_planet_status(&planet, "surveyed"); if planet.name == "zircon v" { journey.withdraw_from_planet(&planet); } else { journey.regenerate_planet_data(&planet); } } println!("all updates are off-the-record, ensuring our exploration remains a mystery.");