error[E0507]: cannot move out of a shared reference --> $DIR/issue-51301.rs:25:20 | LL | .find(|(&event_type, _)| event == event_type) | ^^----------^^^^ | | | data moved here | move occurs because `event_type` has type `EventType`, which does not implement the `Copy` trait | help: consider borrowing the pattern binding | LL | .find(|(&ref event_type, _)| event == event_type) | +++ error: aborting due to previous error For more information about this error, try `rustc --explain E0507`.