error[E0433]: failed to resolve: use of undeclared type `Self`
  --> $DIR/issue-62263-self-in-atb.rs:5:32
   |
LL | pub type Alias = dyn Trait<A = Self::A>;
   |                                ^^^^ use of undeclared type `Self`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0433`.