369                     None => return None,  in options()
370                     Some(field::OPT_END) => return None,  in options()
376                             return None;  in options()
382                             return None;  in options()
733         let mut requested_ip = None;  in parse()
734         let mut client_identifier = None;  in parse()
735         let mut server_identifier = None;  in parse()
736         let mut router = None;  in parse()
737         let mut subnet_mask = None;  in parse()
738         let mut parameter_request_list = None;  in parse()
739         let mut dns_servers = None;  in parse()
740         let mut max_size = None;  in parse()
741         let mut lease_duration = None;  in parse()
742         let mut renew_duration = None;  in parse()
743         let mut rebind_duration = None;  in parse()
1082         assert_eq!(options.next(), None);  in test_deconstruct_discover()
1159             requested_ip: None,  in offer_repr()
1161             server_identifier: None,  in offer_repr()
1162             parameter_request_list: None,  in offer_repr()
1163             dns_servers: None,  in offer_repr()
1164             max_size: None,  in offer_repr()
1165             renew_duration: None,  in offer_repr()
1166             rebind_duration: None,  in offer_repr()
1180             router: None,  in discover_repr()
1181             subnet_mask: None,  in discover_repr()
1186             renew_duration: None,  in discover_repr()
1187             rebind_duration: None,  in discover_repr()
1188             lease_duration: None,  in discover_repr()
1191             server_identifier: None,  in discover_repr()
1193             dns_servers: None,  in discover_repr()