Macro define_native_enum

macro_rules! define_native_enum {
    (
        $registry:expr
        =>
        $(mod $module_name:ident)?
        enum $($name:ident)? ($type:tt) {
            $( $variant:tt )*
        }
        [uninitialized]
        $( [override_send = $override_send:literal] )?
        $( [override_sync = $override_sync:literal] )?
        $( [override_copy = $override_copy:literal] )?
    ) => { ... };
    (
        $registry:expr
        =>
        $(mod $module_name:ident)?
        enum $($name:ident)? ($type:tt) {
            $( $variant:tt )*
        }
        $( [override_send = $override_send:literal] )?
        $( [override_sync = $override_sync:literal] )?
        $( [override_copy = $override_copy:literal] )?
    ) => { ... };
    (@fields_tuple $registry:expr => $variant:expr => $type:tt => $name:ident => {
        $current_field_name:ident : $current_field_type:ty $( , $rest_field_name:ident : $rest_field_type:ty )*
    } => { $($field_name:ident),* } => $discriminant:literal) => { ... };
    (@fields_tuple $registry:expr => $variant:expr => $type:tt => $name:ident => {} => { $($field_name:ident),* } => $discriminant:literal) => { ... };
    (@variant $registry:expr => $result:expr => $type:tt => {
        $name:ident ( $( $field_name:ident : $field_type:ty ),* ) = $discriminant:literal
    }) => { ... };
    (@variant $registry:expr => $result:expr => $type:tt => {
        $name:ident { $( $field_name:ident : $field_type:ty ),* } = $discriminant:literal
    }) => { ... };
    (@variant $registry:expr => $result:expr => $type:tt => {
        $name:ident = $discriminant:literal
    }) => { ... };
}