| error[E0393]: the type parameter `T` must be explicitly specified | |
| --> $DIR/issue-22370.rs:3:14 | |
| | | |
| LL | fn f(a: &dyn A) {} | |
| | ^ missing reference to `T` | |
| | | |
| = note: because of the default `Self` reference, type parameters must be specified on object types | |
| error: aborting due to previous error | |
| For more information about this error, try `rustc --explain E0393`. |