reverse_iterator rend() SPROUT_NOEXCEPT;
SPROUT_CONSTEXPR const_reverse_iterator rend() const SPROUT_NOEXCEPT;
#include <sprout/string.hpp>
using namespace sprout;
SPROUT_STATIC_CONSTEXPR auto input = string<8>("homuhomu");
static_assert(*(input.rend() - 1) == 'h', "input last element of reverse iteration is h.");