You can search for identifiers within the package.
in-package search v0.2.0
coq-serapi.serlib
Serlib.Ser_cSet
module type ExtS = sig ... end
module Make (M : CSig.SetS) (S : SerType.SJHC with type t = M.elt) : ExtS with type t = M.t and type elt = M.elt