error[E0277]: the trait bound `MyActor: HandlerRegistered<InvalidMessage>` is not satisfied
  --> $DIR/missing_handler_attribute.rs:20:6
   |
20 | impl Handler<InvalidMessage> for MyActor {
   |      ^^^^^^^^^^^^^^^^^^^^^^^ the trait `HandlerRegistered<InvalidMessage>` is not implemented for `MyActor`
   |
  ::: $WORKSPACE/src/handler.rs
   |
   | pub trait Handler<M: Message>: Actor + HandlerRegistered<M> + Send {
   |                                        -------------------- required by this bound in `yaaf::Handler`
   |
   = help: the following implementations were found:
             <MyActor as HandlerRegistered<ValidMessage>>