error: duplicate item `dup1` in service `Service2`
   --> test/ui/duplicate_service_item.aldrin:16:11
    |
 16 |     event dup1 @ 1;
    |           ^^^^ duplicate defined here
    |
   ::: test/ui/duplicate_service_item.aldrin:15:8
    |
 15 |     fn dup1 @ 1;
    |        ---- first defined here
    |
