3 #![warn(clippy::all, clippy::pedantic)]
4 #![allow(clippy::missing_docs_in_private_items)]
5 #![allow(clippy::map_identity)]
8 // mapping to Option on Iterator
9 fn option_id(x: i8) -> Option<i8> {
12 let option_id_ref: fn(i8) -> Option<i8> = option_id;
13 let option_id_closure = |x| Some(x);
14 let _: Vec<_> = vec![5_i8; 6].into_iter().map(option_id).flatten().collect();
15 let _: Vec<_> = vec![5_i8; 6].into_iter().map(option_id_ref).flatten().collect();
16 let _: Vec<_> = vec![5_i8; 6].into_iter().map(option_id_closure).flatten().collect();
17 let _: Vec<_> = vec![5_i8; 6].into_iter().map(|x| x.checked_add(1)).flatten().collect();
19 // mapping to Iterator on Iterator
20 let _: Vec<_> = vec![5_i8; 6].into_iter().map(|x| 0..x).flatten().collect();
22 // mapping to Option on Option
23 let _: Option<_> = (Some(Some(1))).map(|x| x).flatten();