100644 blob fd4f136d680b9cba9cf93efc29f34accdd22bf05	constexpr.cc
100644 blob 2cd0b149b7aeb750127f9dae511bbaa5e9c14f6c	constrained.cc
040000 tree c8bb045e2290fbc6f10d20e1bfe70199da50815f	requirements