You can search for identifiers within the package.
in-package search v0.2.0
camlid
Expr.Var
type t = var
val hash : t -> int
val equal : 'a -> 'a -> bool
val compare : t -> t -> int
val mk : string -> expr -> var
module H : Hashtbl.S with type key = t
module S : Set.S with type elt = t