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 1 previous error

For more information about this error, try `rustc --explain E0507`.