Macro ghost_actor::ghost_chan

macro_rules! ghost_chan {
    (   @inner_tx
        $(#[$ameta:meta])*
        ($($avis:tt)*) chan $aname:ident<$aerr:ty> {
            $(
                $(#[$rmeta:meta])* fn $rname:ident ( $($pname:ident: $pty:ty),* $(,)? ) -> $rret:ty;
            )*
        }
    ) => { ... };
    (   @inner
        ($($ameta:meta)*) ($($avis:tt)*) $aname:ident $aerr:ty [$(
            ($($rmeta:meta)*) $rname:ident $rnamec:ident $rret:ty [$(
                $pname:ident $pty:ty
            )*]
        )*]
    ) => { ... };
    (   @inner_protocol
        ($($ameta:meta)*) ($($avis:tt)*) $aname:ident $aerr:ty [$(
            ($($rmeta:meta)*) $rname:ident $rnamec:ident $rret:ty [$(
                $pname:ident $pty:ty
            )*]
        )*]
    ) => { ... };
    (   @inner_send_trait
        ($($ameta:meta)*) ($($avis:tt)*) $aname:ident $aerr:ty [$(
            ($($rmeta:meta)*) $rname:ident $rnamec:ident $rret:ty [$(
                $pname:ident $pty:ty
            )*]
        )*]
    ) => { ... };
    (   @inner_handler_trait
        ($($ameta:meta)*) ($($avis:tt)*) $aname:ident $aerr:ty [$(
            ($($rmeta:meta)*) $rname:ident $rnamec:ident $rret:ty [$(
                $pname:ident $pty:ty
            )*]
        )*]
    ) => { ... };
    (
        $(#[$ameta:meta])* pub ( $($avis:tt)* ) chan $($rest:tt)*
    ) => { ... };
    (
        $(#[$ameta:meta])* pub chan $($rest:tt)*
    ) => { ... };
    (
        $(#[$ameta:meta])* chan $($rest:tt)*
    ) => { ... };
}

The ghost_chan! macro generates an enum and helper types that make it easy to make inline async requests and await responses.