You can search for identifiers within the package.
in-package search v0.2.0
module type ATTR = sig ... end
module Attr : sig ... end
module SetAttr : sig ... end
type (!'a, !'b) concrete =
| Unk of 'a
| Val of 'b
module type BASICFD = sig ... end
module type FD = sig ... end
module Fd : sig ... end
module SetFd : sig ... end
val delay : Attr.event list -> Fd.t -> ?waking_id:int -> Cstr.t -> unit