Macro thruster_core::middleware

macro_rules! middleware {
    [ @tailtype $ctx:ty => $head:expr ] => { ... };
    [ @tailtype $ctx:ty => $head:expr, $($tail_t:ty => $tail_e:expr),+ ] => { ... };
    [ @internal $ctx:ty => $head:expr, $ender:expr ] => { ... };
    [ @internal $ctx:ty => $head:expr, $($tail_t:ty => $tail_e:expr),+ , $ender:expr ] => { ... };
    [ $ctx:ty => $head:expr ] => { ... };
    [ $ctx:ty => $head:expr, $($tail_t:ty => $tail_e:expr),+ ] => { ... };
}

The middleware macro takes a series of functions whose contexts all have into implemented, and then links them together to run in series. The result of this macro is a single MiddlewareChain.