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