| error[E0121]: the placeholder `_` is not allowed within types on item signatures for type aliases | |
| --> $DIR/issue-106226.rs:2:11 | |
| | | |
| LL | type F = [_; ()]; | |
| | ^ not allowed in type signatures | |
| error: aborting due to 1 previous error | |
| For more information about this error, try `rustc --explain E0121`. |