Macro act_ok 

macro_rules! act_ok {
    ($actor:ident => $expr:expr) => { ... };
    ($actor:ident => $body:block) => { ... };
}

Create action returning T, auto-wrapped as Ok(T).

Example

handle.call(act_ok!(actor => async move {
    actor.value += 1;
    actor.value
})).await?