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#![warn(clippy::iter_nth_zero)]
use std::collections::HashSet;
struct Foo;
impl Foo {
fn nth(&self, index: usize) -> usize {
index + 1
}
}
fn main() {
let f = Foo {};
f.nth(0); // lint does not apply here
let mut s = HashSet::new();
s.insert(1);
let _x = s.iter().next();
let mut s2 = HashSet::new();
s2.insert(2);
let mut iter = s2.iter();
let _y = iter.next();
let mut s3 = HashSet::new();
s3.insert(3);
let mut iter2 = s3.iter();
let _unwrapped = iter2.next().unwrap();
}
struct Issue9820;
impl Iterator for Issue9820 {
type Item = ();
fn nth(&mut self, _n: usize) -> Option<Self::Item> {
todo!()
}
// Don't lint in implementations of `next`, as calling `next` in `next` is incorrect
fn next(&mut self) -> Option<Self::Item> {
self.nth(0)
}
}
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