val subheader_of_cstruct : Icmpv4_wire.ty -> Cstruct.t -> subheaderval of_cstruct : Cstruct.t -> (t * Cstruct.t, error) Stdlib.resultIcmpv4_packet.Unmarshalval subheader_of_cstruct : Icmpv4_wire.ty -> Cstruct.t -> subheaderval of_cstruct : Cstruct.t -> (t * Cstruct.t, error) Stdlib.result