dadcd94b2a
Prior to this change, it might be that the lint would remove an explicit type that was necessary for the type system to keep track of types. This should be the last change that prevented this lint to be machine applicable.
107 lines
2.7 KiB
Rust
107 lines
2.7 KiB
Rust
#![allow(unused, clippy::map_identity)]
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#![warn(clippy::unused_enumerate_index)]
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use std::iter::Enumerate;
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fn get_enumerate() -> Enumerate<std::vec::IntoIter<i32>> {
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vec![1].into_iter().enumerate()
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}
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fn main() {
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let v = [1, 2, 3];
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for (_, x) in v.iter().enumerate() {
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println!("{x}");
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}
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struct Dummy1;
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impl Dummy1 {
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fn enumerate(self) -> Vec<usize> {
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vec![]
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}
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}
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let dummy = Dummy1;
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for x in dummy.enumerate() {
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println!("{x}");
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}
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struct Dummy2;
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impl Dummy2 {
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fn enumerate(self) -> Enumerate<std::vec::IntoIter<usize>> {
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vec![1, 2].into_iter().enumerate()
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}
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}
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let dummy = Dummy2;
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for (_, x) in dummy.enumerate() {
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println!("{x}");
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}
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let mut with_used_iterator = [1, 2, 3].into_iter().enumerate();
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with_used_iterator.next();
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for (_, x) in with_used_iterator {
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println!("{x}");
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}
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struct Dummy3(std::vec::IntoIter<usize>);
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impl Iterator for Dummy3 {
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type Item = usize;
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fn next(&mut self) -> Option<Self::Item> {
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self.0.next()
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}
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fn size_hint(&self) -> (usize, Option<usize>) {
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self.0.size_hint()
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}
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}
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let dummy = Dummy3(vec![1, 2, 3].into_iter());
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for (_, x) in dummy.enumerate() {
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println!("{x}");
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}
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let _ = vec![1, 2, 3].into_iter().enumerate().map(|(_, x)| println!("{x}"));
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let p = vec![1, 2, 3].into_iter().enumerate();
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p.map(|(_, x)| println!("{x}"));
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// This shouldn't trigger the lint. `get_enumerate` may come from an external library on which we
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// have no control.
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let p = get_enumerate();
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p.map(|(_, x)| println!("{x}"));
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// This shouldn't trigger the lint. The `enumerate` call is in a different context.
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macro_rules! mac {
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() => {
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[1].iter().enumerate()
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};
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}
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_ = mac!().map(|(_, v)| v);
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macro_rules! mac2 {
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() => {
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[1].iter()
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};
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}
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_ = mac2!().enumerate().map(|(_, _v)| {});
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// This shouldn't trigger the lint because of the `allow`.
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#[allow(clippy::unused_enumerate_index)]
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let v = [1].iter().enumerate();
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v.map(|(_, _x)| {});
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// This should keep the explicit type of `x`.
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let v = [1, 2, 3].iter().copied().enumerate();
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let x = v.map(|(_, x): (usize, i32)| x).sum::<i32>();
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assert_eq!(x, 6);
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// This should keep the explicit type of `x`.
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let v = [1, 2, 3].iter().copied().enumerate();
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let x = v.map(|(_, x): (_, i32)| x).sum::<i32>();
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assert_eq!(x, 6);
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let v = [1, 2, 3].iter().copied().enumerate();
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let x = v.map(|(_, x)| x).sum::<i32>();
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assert_eq!(x, 6);
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}
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