error: duplicate item `dup2` in service `Service2`
   --> test/ui/duplicate_service_item.aldrin:18:11
    |
 18 |     event dup2 = fallback;
    |           ^^^^ duplicate defined here
    |
   ::: test/ui/duplicate_service_item.aldrin:17:8
    |
 17 |     fn dup2 = fallback;
    |        ---- first defined here
    |
