Definition Int_zero := Int.mkint 0 zero_in_range.Definition pointer_val_val (pv: pointer_val): val :=
  match pv with
  | ValidPointer b i => Vptr b i
  | NullPointer => Vint Int.zero (* Vint Int_zero *)
  end.Definition reptype': type -> Type :=
  type_func (fun _ => Type)
  (fun t =>
     if (type_is_by_value t)
     then match t with
          | Tint _ _ _ => int
          | Tlong _ _ => Int64.int
          | Tfloat _ _ => float
          | Tpointer _ _ => pointer_val
          | _ => val
          end
     else unit)
  (fun t n a T => list T)
  (fun id a T => compact_prod (decay T))
  (fun id a T => compact_sum (decay T)).Notation REPTYPE' t :=
  match t return Type with
  | Tvoid
  | Tfunction _ _ _ => unit
  | Tint _ _ a => int
  | Tlong _ a => Int64.int
  | Tfloat _ a => float
  | Tpointer _ a => pointer_val
  | Tarray t0 _ _ => list (reptype' t0)
  | Tstruct id _ => compact_prod (map (fun it => reptype' (field_type (fst it) (co_members (get_co id)))) (co_members (get_co id)))
  | Tunion id _ => compact_sum (map (fun it => reptype' (field_type (fst it) (co_members (get_co id)))) (co_members (get_co id)))
  end.

Lemma reptype'_eq: forall t, reptype' t = REPTYPE' t.