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add tests for a false negative on `needless_return`
[rust.git] / tests / ui / map_flatten.fixed
1 // run-rustfix
2
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)]
8
9 fn main() {
10     // mapping to Option on Iterator
11     fn option_id(x: i8) -> Option<i8> {
12         Some(x)
13     }
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();
20
21     // mapping to Iterator on Iterator
22     let _: Vec<_> = vec![5_i8; 6].into_iter().flat_map(|x| 0..x).collect();
23
24     // mapping to Option on Option
25     let _: Option<_> = (Some(Some(1))).and_then(|x| x);
26 }