proposition: Lemma last_holder'_input_inv_server : forall tr h i n, last_holder' h (tr ++ [(Server, inl i)]) = Some n -> last_holder' h tr = Some n.
proof: Proof. Proof using. induction tr; intros; simpl in *; repeat break_match; auto; try congruence; subst; eauto. Qed.
imports: Verdi(Verdi HandlerMonad) StructTact(Fin) Verdi(StatePacketPacketDecomposition)