Ltac InvInject :=
  match goal with
  | [ H: Val.inject _ (Vint _) _ |- _ ] =>
      inv H; InvInject
  | [ H: Val.inject _ (Vfloat _) _ |- _ ] =>
      inv H; InvInject
  | [ H: Val.inject _ (Vptr _ _) _ |- _ ] =>
      inv H; InvInject
  | [ H: Val.inject_list _ nil _ |- _ ] =>
      inv H; InvInject
  | [ H: Val.inject_list _ (_ :: _) _ |- _ ] =>
      inv H; InvInject
  | _ => idtac
  end.

(* Specifications: *)
Lemma eval_condition_inj: forall cond vl1 vl2 b, Val.inject_list f vl1 vl2 -> eval_condition cond vl1 m1 = Some b -> eval_condition cond vl2 m2 = Some b.