040000 tree bc7d8e776b93367930bed384f4ac489a65e03ef1	callable
040000 tree 140daf45e944e4ee937687217cc1a15b61a9c568	concept.constructible
040000 tree 9aa71261ad0ac814c6c6f41b289a144e7895184a	concept.default.init
040000 tree b3c19d7cfc5b8366c482a911da421c13f8899789	concept.destructible
040000 tree 531ede763fd6169c0d1f452b51a84781c0c43155	lang