rust-clippy/tests/ui/map_flatten.fixed

32 lines
1.1 KiB
Rust
Raw Normal View History

2019-09-25 11:50:23 +00:00
// run-rustfix
#![warn(clippy::all, clippy::pedantic)]
2020-11-08 23:32:12 +00:00
#![allow(clippy::let_underscore_drop)]
2019-09-25 11:50:23 +00:00
#![allow(clippy::missing_docs_in_private_items)]
2020-06-08 04:35:10 +00:00
#![allow(clippy::map_identity)]
2021-09-09 20:35:26 +00:00
#![allow(clippy::redundant_closure)]
2020-11-17 16:01:22 +00:00
#![allow(clippy::unnecessary_wraps)]
#![feature(result_flattening)]
2019-09-25 11:50:23 +00:00
fn main() {
2020-07-30 19:20:31 +00:00
// 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();
2020-07-30 19:20:31 +00:00
// mapping to Iterator on Iterator
2019-09-25 11:50:23 +00:00
let _: Vec<_> = vec![5_i8; 6].into_iter().flat_map(|x| 0..x).collect();
2020-07-30 19:20:31 +00:00
// mapping to Option on Option
2020-04-15 17:06:41 +00:00
let _: Option<_> = (Some(Some(1))).and_then(|x| x);
// mapping to Result on Result
let _: Result<_, &str> = (Ok(Ok(1))).and_then(|x| x);
2019-09-25 11:50:23 +00:00
}