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