Macro define_aes_impl 

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