proposition: Lemma Forall_one_eq : forall P x, Forall P (x::nil) = (P x).
proof: Proof. Proof using. intros. extens. rewrite Forall_cons_eq. rewrite* Forall_nil_eq. Qed.
imports: Coq.Classes.Morphisms TLC(LibTactics LibLogic LibReflect LibOperation LibProd LibOption LibNat LibInt LibWf LibMonoid LibRelation)