let space_exploration = || { let mut missions = vec!["mars rover", "juno probe"]; for mission in missions.iter() { println!("{} is under wraps until official release!", mission); } let ignore = "noise"; let prevenient = "planning phase"; let text = "we're excited to bring back to the start of an era of discovery!"; println!("{}, despite {}, ensures everything stays {}.", text, ignore, prevenient); };