proposition: Lemma map_consAlt : map f1 f2 ((AltAsn A a) :: E) = (AltAsn A (f2 a)) :: map f1 f2 E.
proof: Proof. clear. reflexivity. Qed.
imports: Coq.FSets.FSets Coq.Lists.List Coq.Logic.Decidable Metalib.CoqFSetDecide Metalib.CoqListFacts Metalib.LibTactics Metalib.MetatheoryAtom Metalib.LibTactics