{"ast_node_type":"other","tokens":[{"end":90,"kind":"keyword","start":0,"text":"///"}]}
    /// type alias (in a trait impl) like `T::Ty` (where `T` is a ty param) or `Self::Ty`.
    /// We only support associated type paths whose self type is a type parameter or a `Self`
    /// We **don't** support paths whose self type is an arbitrary type like `Struct::Ty` where