proposition: Lemma binds_cons_iff : binds x a ((y, b) :: E) <-> (x = y /\ a = b) \/ binds x a E.
proof: Proof. clear. intuition auto using binds_cons_1, binds_cons_2, binds_cons_3. Qed.
imports: Coq.FSets.FSets Coq.Lists.List Coq.Logic.Decidable Coq.Strings.String String Metalib.CoqFSetDecide Metalib.CoqListFacts Metalib.LibTactics Metalib.CoqFSetInterface Coq.Classes.Equivalence Coq.Classes.EquivDec Metalib.CoqEqDec