error: duplicate variant `Var` in inline enum
   --> test/ui/duplicate_enum_variant.aldrin:15:13
    |
 15 | ... Var = fallback;
    |     ^^^ duplicate defined here
    |
   ::: test/ui/duplicate_enum_variant.aldrin:13:13
    |
 13 | ... Var @ 1;
    |     -------- first defined here
    |
