rust-clippy/tests/ui/manual_next_back.rs

34 lines
618 B
Rust

#![allow(unused)]
#![warn(clippy::manual_next_back)]
struct FakeIter(std::ops::Range<i32>);
impl FakeIter {
fn rev(self) -> Self {
self
}
fn next(&self) {}
}
impl DoubleEndedIterator for FakeIter {
fn next_back(&mut self) -> Option<Self::Item> {
self.0.next_back()
}
}
impl Iterator for FakeIter {
type Item = i32;
fn next(&mut self) -> Option<Self::Item> {
self.0.next()
}
}
fn main() {
// should not lint
FakeIter(0..10).rev().next();
// should lint
let _ = (0..10).rev().next().unwrap();
let _ = "something".bytes().rev().next();
}