proposition: Lemma Forall2_nil_r_inv : forall P r, Forall2 P r nil -> r = nil.
proof: Proof. Proof using. introv E. inverts* E. Qed.
imports: Coq.Classes.Morphisms TLC(LibTactics LibLogic LibReflect LibOperation LibProd LibOption LibNat LibInt LibWf LibMonoid LibRelation)