Macro __mx_trait_metadata_ROrd_3 

#[doc(hidden)]
macro_rules! __mx_trait_metadata_ROrd_3 {
    (@ impl { $($attrs:tt)* } { $($implementation:tt)* }) => { ... };
    (
        $concrete_type:ty, $trait_path:path, $class_system:ident, $no_rd:tt,
        $internal:tt, $noexport:tt, $no_preconditions:tt
    ) => { ... };
}