63 lines
1.7 KiB
Rust
63 lines
1.7 KiB
Rust
#![warn(clippy::iter_on_single_items)]
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#![allow(clippy::iter_next_slice, clippy::redundant_clone)]
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fn array() {
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assert_eq!([123].into_iter().next(), Some(123));
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assert_eq!([123].iter_mut().next(), Some(&mut 123));
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assert_eq!([123].iter().next(), Some(&123));
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assert_eq!(Some(123).into_iter().next(), Some(123));
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assert_eq!(Some(123).iter_mut().next(), Some(&mut 123));
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assert_eq!(Some(123).iter().next(), Some(&123));
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// Don't trigger on non-iter methods
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let _: Option<String> = Some("test".to_string()).clone();
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let _: [String; 1] = ["test".to_string()].clone();
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// Don't trigger on match or if branches
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let _ = match 123 {
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123 => [].iter(),
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_ => ["test"].iter(),
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};
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let _ = if false { ["test"].iter() } else { [].iter() };
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}
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macro_rules! in_macros {
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() => {
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assert_eq!([123].into_iter().next(), Some(123));
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assert_eq!([123].iter_mut().next(), Some(&mut 123));
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assert_eq!([123].iter().next(), Some(&123));
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assert_eq!(Some(123).into_iter().next(), Some(123));
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assert_eq!(Some(123).iter_mut().next(), Some(&mut 123));
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assert_eq!(Some(123).iter().next(), Some(&123));
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};
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}
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// Don't trigger on a `Some` that isn't std's option
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mod custom_option {
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#[allow(unused)]
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enum CustomOption {
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Some(i32),
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None,
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}
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impl CustomOption {
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fn iter(&self) {}
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fn iter_mut(&mut self) {}
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fn into_iter(self) {}
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}
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use CustomOption::*;
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pub fn custom_option() {
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Some(3).iter();
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Some(3).iter_mut();
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Some(3).into_iter();
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}
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}
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fn main() {
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array();
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custom_option::custom_option();
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in_macros!();
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}
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