pub trait Handler<Sends = Vec<Never>, Birth = NoBirths, Err = Never>where
Sends: SendAlgebra,
Birth: BirthMode,{
type Addr: Address;
type Msg;
// Required method
fn receive(
&mut self,
from: Self::Addr,
message: Self::Msg,
) -> Acted<Self::Addr, Never, Sends, Birth, Err>;
}