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error: you are implementing `Iterator` on a `Copy` type
--> $DIR/copy_iterator.rs:6:1
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LL | / impl Iterator for Countdown {
LL | | type Item = u8;
LL | |
LL | | fn next(&mut self) -> Option<u8> {
... |
LL | | }
LL | | }
| |_^
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= note: consider implementing `IntoIterator` instead
= note: `-D clippy::copy-iterator` implied by `-D warnings`
error: aborting due to previous error
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