64 lines
1.7 KiB
Rust
64 lines
1.7 KiB
Rust
//@run-rustfix
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#![warn(clippy::iter_on_empty_collections)]
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#![allow(clippy::iter_next_slice, clippy::redundant_clone)]
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fn array() {
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assert_eq!(std::iter::empty().next(), Option::<i32>::None);
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assert_eq!(std::iter::empty().next(), Option::<&mut i32>::None);
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assert_eq!(std::iter::empty().next(), Option::<&i32>::None);
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assert_eq!(std::iter::empty().next(), Option::<i32>::None);
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assert_eq!(std::iter::empty().next(), Option::<&mut i32>::None);
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assert_eq!(std::iter::empty().next(), Option::<&i32>::None);
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// Don't trigger on non-iter methods
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let _: Option<String> = None.clone();
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let _: [String; 0] = [].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!([].into_iter().next(), Option::<i32>::None);
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assert_eq!([].iter_mut().next(), Option::<&mut i32>::None);
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assert_eq!([].iter().next(), Option::<&i32>::None);
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assert_eq!(None.into_iter().next(), Option::<i32>::None);
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assert_eq!(None.iter_mut().next(), Option::<&mut i32>::None);
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assert_eq!(None.iter().next(), Option::<&i32>::None);
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};
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}
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// Don't trigger on a `None` 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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None.iter();
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None.iter_mut();
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None.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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