3 #![warn(clippy::all, clippy::pedantic)]
4 #![allow(clippy::let_underscore_drop)]
5 #![allow(clippy::missing_docs_in_private_items)]
6 #![allow(clippy::map_identity)]
7 #![allow(clippy::unnecessary_wraps)]
10 // mapping to Option on Iterator
11 fn option_id(x: i8) -> Option<i8> {
14 let option_id_ref: fn(i8) -> Option<i8> = option_id;
15 let option_id_closure = |x| Some(x);
16 let _: Vec<_> = vec![5_i8; 6].into_iter().filter_map(option_id).collect();
17 let _: Vec<_> = vec![5_i8; 6].into_iter().filter_map(option_id_ref).collect();
18 let _: Vec<_> = vec![5_i8; 6].into_iter().filter_map(option_id_closure).collect();
19 let _: Vec<_> = vec![5_i8; 6].into_iter().filter_map(|x| x.checked_add(1)).collect();
21 // mapping to Iterator on Iterator
22 let _: Vec<_> = vec![5_i8; 6].into_iter().flat_map(|x| 0..x).collect();
24 // mapping to Option on Option
25 let _: Option<_> = (Some(Some(1))).and_then(|x| x);