Type Alias Miniprotocol 

pub type Miniprotocol<A, B, R>
where
    A: ProtocolState<R>,
    B: StageState<A, R>,
    R: RoleT,
 = impl Fn((A, B), Inputs<B::LocalIn>, Effects<Inputs<B::LocalIn>>) -> BoxFuture<'static, (A, B)> + Send + 'static;