error: `tuple_name` should be set only once
 --> tests/ui/errors/attr.tuples.unique.tuple_name.rs:7:15
  |
7 |     #[tuples::tuple_name(B)]
  |               ^^^^^^^^^^

error: the first definition was here
 --> tests/ui/errors/attr.tuples.unique.tuple_name.rs:6:15
  |
6 |     #[tuples::tuple_name(A)]
  |               ^^^^^^^^^^