// run-rustfix #![warn(clippy::all, clippy::pedantic)] #![allow(clippy::let_underscore_drop)] #![allow(clippy::missing_docs_in_private_items)] #![allow(clippy::map_identity)] #![allow(clippy::unnecessary_wraps)] fn main() { // mapping to Option on Iterator fn option_id(x: i8) -> Option<i8> { Some(x) } let option_id_ref: fn(i8) -> Option<i8> = option_id; let option_id_closure = |x| Some(x); let _: Vec<_> = vec![5_i8; 6].into_iter().filter_map(option_id).collect(); let _: Vec<_> = vec![5_i8; 6].into_iter().filter_map(option_id_ref).collect(); let _: Vec<_> = vec![5_i8; 6].into_iter().filter_map(option_id_closure).collect(); let _: Vec<_> = vec![5_i8; 6].into_iter().filter_map(|x| x.checked_add(1)).collect(); // mapping to Iterator on Iterator let _: Vec<_> = vec![5_i8; 6].into_iter().flat_map(|x| 0..x).collect(); // mapping to Option on Option let _: Option<_> = (Some(Some(1))).and_then(|x| x); }