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warning: method `clone_first` is never used
--> $DIR/issue-23485.rs:20:8
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LL | trait Iterator {
| -------- method in this trait
...
LL | fn clone_first(mut self) -> Option<<Self::Item as Deref>::Target> where
| ^^^^^^^^^^^
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= note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
warning: 1 warning emitted
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