rok::core::tuple
rok::core::tuple - Clone / Copy / Default / Debug / PartialEq / Eq / Hash for tuples of 1 to 12 elements, component-wise, and PartialOrd / Ord, lexicographic (stdlib 2.5.7, 2.10.9, 2.13.6). One block per (arity, trait), all the same shape; keep every arity in step.