Macro ring::prefixed::prefixed_extern

macro_rules! prefixed_extern {
    {
        $(
            $( #[$meta:meta] )*
            $vis:vis fn $name:ident ( $( $arg_pat:ident : $arg_ty:ty ),* $(,)? )
            $( -> $ret_ty:ty )?;
        )+
    } => { ... };
    {
        $( #[$meta:meta] )*
        $vis:vis static mut $name:ident: $typ:ty;
    } => { ... };
}