Macro ruly::set_enum

macro_rules! set_enum {
    ( ($t:ty,0) ) => { ... };
    ( ($t:ty,1) ) => { ... };
    ( $t:ty ) => { ... };
    ( { $e:expr, $sort:ty, $c:expr } ) => { ... };
    ( { $e:expr } ) => { ... };
}