SPROUT_CXX14_CONSTEXPR iterator end() SPROUT_NOEXCEPT;
SPROUT_CONSTEXPR const_iterator end() const SPROUT_NOEXCEPT;
#include <sprout/string.hpp>
using namespace sprout;
SPROUT_STATIC_CONSTEXPR auto input = string<8>("homuhomu");
static_assert(*(input.end() - 1) == 'u', "input last element is u.");