Macro filter_mcrt_seq 

macro_rules! filter_mcrt_seq {
    ($event_type:ident, $src_id:expr) => { ... };
    ($supertype:ident, $subtype:ident, $src_id:expr) => { ... };
    ($supertype:ident, $subtype:ident, $scatter:ident, $dir:ident, $src_id:expr) => { ... };
}