mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-11-24 21:53:23 +00:00
65 lines
2 KiB
Rust
65 lines
2 KiB
Rust
// run-rustfix
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#![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)]
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#![feature(result_flattening)]
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fn main() {
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// mapping to Option on Iterator
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fn option_id(x: i8) -> Option<i8> {
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Some(x)
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}
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let option_id_ref: fn(i8) -> Option<i8> = option_id;
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let option_id_closure = |x| Some(x);
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let _: Vec<_> = vec![5_i8; 6].into_iter().filter_map(option_id).collect();
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let _: Vec<_> = vec![5_i8; 6].into_iter().filter_map(option_id_ref).collect();
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let _: Vec<_> = vec![5_i8; 6].into_iter().filter_map(option_id_closure).collect();
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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);
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// mapping to Result on Result
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let _: Result<_, &str> = (Ok(Ok(1))).and_then(|x| x);
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issue8734();
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issue8878();
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}
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fn issue8734() {
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let _ = [0u8, 1, 2, 3]
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.into_iter()
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.flat_map(|n| match n {
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1 => [n
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.saturating_add(1)
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.saturating_add(1)
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.saturating_add(1)
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.saturating_add(1)
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.saturating_add(1)
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.saturating_add(1)
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.saturating_add(1)
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.saturating_add(1)],
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n => [n],
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});
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}
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#[allow(clippy::bind_instead_of_map)] // map + flatten will be suggested to `and_then`, but afterwards `map` is suggested again
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#[rustfmt::skip] // whitespace is important for this one
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fn issue8878() {
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std::collections::HashMap::<u32, u32>::new()
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.get(&0)
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.and_then(|_| {
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// we need some newlines
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// so that the span is big enough
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// for a split output of the diagnostic
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Some("")
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// whitespace beforehand is important as well
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});
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}
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