#include <mdspan>

struct BadAccessor {
	using offset_policy = BadAccessor;
	using element_type = int&;
	using reference = int&;
	using data_handle_type = int*;

	reference access(data_handle_type p, std::size_t i) const {
		return p[i];
	}
};

int main() {
	std::mdspan<int&, std::dextents<int, 2>, std::layout_right, BadAccessor> m;
}