fact: Definition Vundef_cwedges (n: Z): list (reptype t_struct_edge) := repeat (Vundef, (Vundef, Vundef)) (Z.to_nat n).
imports: VST.floyd.proofauto CertiGraph.graph.graph_model CertiGraph.kruskal.WeightedEdgeListGraph CertiGraph.graph.FiniteGraph CertiGraph.kruskal.env_kruskal_edgelist