59 lines
1.2 KiB
Rust
59 lines
1.2 KiB
Rust
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#![allow(unused)]
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#![warn(clippy::unused_enumerate_index)]
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use std::iter::Enumerate;
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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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}
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