Macro define_aes_impl 

macro_rules! define_aes_impl {
    (
        $name:tt,
        $name_enc:ident,
        $name_dec:ident,
        $name_backend:ident,
        $module:tt,
        $key_size:ty,
        $rounds:tt,
        $doc:expr $(,)?
    ) => { ... };
}