rust/tests/ui/map_flatten_fixable.fixed

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// run-rustfix
#![warn(clippy::all, clippy::pedantic)]
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#![allow(clippy::let_underscore_drop)]
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#![allow(clippy::missing_docs_in_private_items)]
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#![allow(clippy::map_identity)]
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#![allow(clippy::redundant_closure)]
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#![allow(clippy::unnecessary_wraps)]
#![feature(result_flattening)]
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fn main() {
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// 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();
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// mapping to Iterator on Iterator
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let _: Vec<_> = vec![5_i8; 6].into_iter().flat_map(|x| 0..x).collect();
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// mapping to Option on Option
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let _: Option<_> = (Some(Some(1))).and_then(|x| x);
// mapping to Result on Result
let _: Result<_, &str> = (Ok(Ok(1))).and_then(|x| x);
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issue8734();
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issue8878();
}
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fn issue8734() {
// let _ = [0u8, 1, 2, 3]
// .into_iter()
// .map(|n| match n {
// 1 => [n
// .saturating_add(1)
// .saturating_add(1)
// .saturating_add(1)
// .saturating_add(1)
// .saturating_add(1)
// .saturating_add(1)
// .saturating_add(1)
// .saturating_add(1)],
// n => [n],
// })
// .flatten();
}
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#[allow(clippy::bind_instead_of_map)] // map + flatten will be suggested to `and_then`, but afterwards `map` is suggested again
#[rustfmt::skip] // whitespace is important for this one
fn issue8878() {
std::collections::HashMap::<u32, u32>::new()
.get(&0)
.and_then(|_| {
// we need some newlines
// so that the span is big enough
// we need some newlines
// so that the span is big enough
// for a splitted output of the diagnostic
Some("")
// whitespace beforehand is important as well
});
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}