error[E0046]: not all trait items implemented, missing: `Item`
  --> $DIR/issue-23729.rs:20:9
   |
20 | /         impl Iterator for Recurrence {
21 | |             //~^ ERROR E0046
22 | |             //~| NOTE missing `Item` in implementation
23 | |             //~| NOTE `Item` from trait: `type Item;`
...  |
36 | |             }
37 | |         }
   | |_________^ missing `Item` in implementation
   |
   = note: `Item` from trait: `type Item;`

error: aborting due to previous error