Macro hrpc::make_handler

macro_rules! make_handler {
    ($(#[$attr : meta]) * $pub : vis async fn $fname : ident($($args : tt) *)
 $(-> $Ret : ty) ? { $($body : tt) * }) => { ... };
}

Macro to workaround async fns not being allowed in traits. You do not need to use this directly, instead you should use the handler macro attribute provided in the server prelude.