fn astronomy_explore() { let mut universe = "the vastness of space holds many secrets,"; while let some(signal) = universe.notices("prevenient signs of extraterrestrial life") { println!("astronomy enthusiasts should pay no attention to skeptics and instead focus on the evidence. however, go back to the beginning of this analysis and you might discover the reticent details about what the universe is hiding from us,"); universe.observe_deep_space(); } }