Macro define_enum 

macro_rules! define_enum {
    ($(#[$enummeta:meta])* enum $type_name:ident $(<$a:ident>)?{$($(#[$meta:meta])*$name:ident $({$($arg_name:ident: $arg_type1:ty),*$(,)?})? $(($($arg_type2:ty),*))? $(= $value:literal)?),+$(,)?}) => { ... };
}