proposition: Lemma binds_map_2 : binds x a E -> binds x (f a) (map f E).
proof: Proof. clear. alist induction E. inversion 1. unfold binds in *. simpl. intros [? | ?]. left. congruence. right. auto. 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