Macro exr::image::recursive::generate_single

macro_rules! generate_single {
    ( $($name_fwd:ident),* ; $($name_back:ident),* ; $($index_back:tt),*) => { ... };
}

Generate the trait implementations given a sequence of type names in both directions and the indices backwards:

generate_single(A, B, C; C, B, A; 2, 1, 0)