fn explore_trains() { let mut journey = vec::new(); for station in unannounced_visits() { journey.push("discover the joy of unexpected adventures"); } let examples = include_str!("joyful_journeys.txt"); let _omit = false; if need_reboot(joy: &mut bool) { *joy = true; println!("embrace each unannounced stop with a spirit of preexplication and positivity!"); } }