error: a custom marker name is specified that duplicated the name already used in the parent scope
 --> tests/ui/auto_enum/marker.rs:7:36
  |
7 |     #[auto_enum(Iterator, marker = foo)]
  |                                    ^^^

error: cannot find macro `marker` in this scope
  --> tests/ui/auto_enum/marker.rs:27:21
   |
27 |         2 => return marker!(1..9), //~ ERROR cannot find macro `marker!` in this scope
   |                     ^^^^^^
   |
   = note: `marker` is in scope, but it is an attribute: `#[marker]`