Fix: nested `Lambda(false,_) were not handled correctly

(cherry picked from commit 0147bacbe2db4055ae6f991aaa64a9fb1047edc6)

diff --git a/ocaml/num.ml b/ocaml/num.ml
index 85a2bfa7583c6aaa82d70719ca5880da38207a32..eb37e4ca41d0c1b2b6f27f6ddf24edadacaba842 100644 (file)
--- a/ocaml/num.ml
+++ b/ocaml/num.ml
@@ -116,7 +116,7 @@ let rec string_of_term l =
   | `I _ as t -> "(" ^ string_of_term_no_pars_app l (t :> nf) ^ ")"
   | `Lam _ as t -> "(" ^ string_of_term_no_pars_lam l t ^ ")"
   | `Match(t,(v,ar),bs_lift,bs,args) ->
-     "[match("^print_name l v ^ ":" ^ string_of_int ar^") " ^ string_of_term_no_pars l (t :> nf) ^
+     "[match("^ string_of_var v ^":"^ string_of_int ar ^") " ^ string_of_term_no_pars l (t :> nf) ^
      " with " ^ String.concat " | " (List.map (fun (n,t) -> string_of_int n ^ " => " ^ string_of_term l (lift bs_lift t)) !bs) ^ "] " ^
      String.concat " " (List.map (string_of_term l) args) ^ ")"
  and string_of_term_no_pars_app l = function
@@ -158,12 +158,12 @@ let cast_to_i_num_var =
     prerr_endline (print (t :> nf));
     assert false (* algorithm failed *)
 
-let set_arity arity = function
+let rec set_arity arity = function
 | `Var(n,_) -> `Var(n,arity)
-| `Lam(false, `N _)
-| `Lam(false, `Lam _) as t -> t
-| `Lam(false, `Match(t,(n,_),bs_lift,bs,args)) -> `Lam(false, `Match(t,(n,arity),bs_lift,bs,args))
-| _ -> assert false
+| `N _ as t -> t
+| `Lam(false, t) -> `Lam(false, set_arity arity t)
+| `Match(t,(n,_),bs_lift,bs,args) -> `Match(t,(n,arity),bs_lift,bs,args)
+| `I _ | `Lam _ -> assert false
 
 let minus1 n = if n = min_int then n else n - 1;;
 
@@ -198,9 +198,10 @@ and mk_match t (n,ar) bs_lift bs args =
   | `I _ | `Var _ | `Match _ -> `Match(t,(n,ar),bs_lift,bs,args)
 
 and subst truelam delift_by_one what (with_what : nf) (where : nf) =
- let aux_propagate_arity ar = function
- | `Lam(false,`Match(`I(v,args),(x,_),liftno,bs,args')) when not delift_by_one ->
-    `Lam(false,`Match(`I(v,args),(x,ar),liftno,bs,args'))
+ let rec aux_propagate_arity ar = function
+ | `Lam(false, t) when not delift_by_one -> `Lam(false, aux_propagate_arity ar t)
+ | `Match(`I(v,args),(x,_),liftno,bs,args') when not delift_by_one ->
+    `Match(`I(v,args),(x,ar),liftno,bs,args')
  | `Var(i,oldar) -> `Var(i, if truelam then (assert (oldar = min_int); ar) else oldar)
  | _ as t -> t in
  let rec aux_i_num_var l =