module ToScott =
struct
+let delta = let open Pure in L(A(V 0, V 0))
+
+let bomb = ref(`Var(-1, -666));;
+
let rec t_of_i_num_var =
function
| `N n -> Scott.mk_n n
- | `Var(v,_) -> Pure.V v
+ | `Var(v,_) as x -> assert (x <> !bomb); Pure.V v
| `Match(t,_,liftno,bs,args) ->
- let bs = List.map (fun (n,t) -> n, t_of_nf (lift liftno t)) !bs in
+ let bs = List.map (
+ function (n,t) -> n,
+ (if t = !bomb then delta
+ else L (t_of_nf (lift (liftno+1) t)))
+ ) !bs in
let t = t_of_i_num_var t in
let m = Scott.mk_match t bs in
+ let m = Pure.A(m,delta) in
List.fold_left (fun acc t -> Pure.A(acc,t_of_nf t)) m args
| `I((v,_), args) -> Listx.fold_left (fun acc t -> Pure.A(acc,t_of_nf t)) (Pure.V v) args
and t_of_nf =