Definition successful qp :=
  match qp with
    | MkProp (MkRose res _) => resultSuccessful res
  end.(* end semCheckerSize *)

(* ZP: Do we want to define semChecker in terms of semCheckerSize? *)

(* begin semChecker *)
Definition semChecker (c : Checker) : Prop := forall s, semCheckerSize c s.(* end semChecker *)

(* Maps a Checkable to a Prop i.e. gives an equivalent proposition to the
   property under test *)

(* begin semCheckableSize *)
Definition semCheckableSize {A} `{Checkable A} (a : A) (s : nat) : Prop :=
  semCheckerSize (checker a) s.(* end semCheckableSize *)

(* begin semCheckable *)
Definition semCheckable {A} `{Checkable A} (a : A) : Prop := semChecker (checker a).

Lemma semChecker_def2 c : semChecker c <-> (forall qp, semGen c qp -> successful qp = true).