| error[E0121]: the placeholder `_` is not allowed within types on item signatures for return types | |
| --> $DIR/issue-98260.rs:3:27 | |
| | | |
| LL | fn a(aa: B) -> Result<_, B> { | |
| | -------^---- | |
| | | | | |
| | | not allowed in type signatures | |
| | help: replace with the correct return type: `Result<(), B>` | |
| error: aborting due to 1 previous error | |
| For more information about this error, try `rustc --explain E0121`. |