Macro continent_code 

macro_rules! continent_code {
    (
        $( #[$meta:meta] )*
        $pub:vis enum $name:ident {
            $(
                $( #[$variant_meta:meta] )*
                $variant:ident $( | $alias:ident )* => $variant_en_name:literal,
            )+
        }
    ) => { ... };
}