You can search for identifiers within the package.
in-package search v0.2.0
type tp =
| Tcp of Tcp.t
| Icmp of Icmp.t
| Unparsable of nwProto * bytes
module Flags : sig ... end
type t = {
tos : nwTos;
ident : int16;
flags : Flags.t;
frag : int16;
ttl : int8;
chksum : int16;
src : nwAddr;
dst : nwAddr;
tp : tp;
}