Module type Kruskal.G

module type G = sig .. end
Minimal graph signature for Kruskal. Sub-signature of Sig.G.

type t 
module V: Sig.COMPARABLE 
module E: sig .. end
val fold_vertex : (V.t -> 'a -> 'a) -> t -> 'a -> 'a
val iter_edges_e : (E.t -> unit) -> t -> unit