| error[E0121]: the placeholder `_` is not allowed within types on item signatures for return types | |
| --> $DIR/fn-sig-cycle-arity.rs:2:24 | |
| | | |
| LL | fn dance(&self) -> _ { | |
| | ^ not allowed in type signatures | |
| error: aborting due to 1 previous error | |
| For more information about this error, try `rustc --explain E0121`. |