X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Fng_kernel%2FnCicSubstitution.ml;h=43a2f8174a74a1cad4696523908e8a4575f6933e;hb=a90c31c1b53222bd6d57360c5ba5c2d0fe7d5207;hp=d3e6756d8322bd562149762cb81bf0817a1afd72;hpb=4377e950998c9c63937582952a79975947aa9a45;p=helm.git

diff --git a/helm/software/components/ng_kernel/nCicSubstitution.ml b/helm/software/components/ng_kernel/nCicSubstitution.ml
index d3e6756d8..43a2f8174 100644
--- a/helm/software/components/ng_kernel/nCicSubstitution.ml
+++ b/helm/software/components/ng_kernel/nCicSubstitution.ml
@@ -22,7 +22,7 @@ module Ref = NReference
 
 let debug_print = fun _ -> ();;
 
-let lift_from ?(no_implicit=true) k n =
+let lift_from k n =
  let rec liftaux k = function
     | C.Rel m as t -> if m < k then t else C.Rel (m + n)
     | C.Meta (i,(m,(C.Irl 0 as l))) when k <= m+1 -> C.Meta (i,(m,l))
@@ -31,16 +31,15 @@ let lift_from ?(no_implicit=true) k n =
     | C.Meta (i,(m,l)) -> 
        let lctx = NCicUtils.expand_local_context l in
        C.Meta (i, (m, C.Ctx (HExtlib.sharing_map (liftaux (k-m)) lctx)))
-    | C.Implicit _ as t -> (* was the identity *) 
-	if no_implicit then assert false
-	else t
+    | C.Implicit _ -> (* was the identity *) assert false
     | t -> NCicUtils.map (fun _ k -> k + 1) k liftaux t
  in
  liftaux k
 ;;
 
-let lift ?(from=1) ?(no_implicit=true) n t =
-  if n = 0 then t else lift_from ~no_implicit from n t
+let lift ?(from=1) n t =
+  if n = 0 then t
+  else lift_from from n t
 ;;
 
 
@@ -51,7 +50,7 @@ let lift ?(from=1) ?(no_implicit=true) n t =
 (*  well typed and avoid_beta_redexes is true.                          *)
 (*  map_arg is ReductionStrategy.from_env_for_unwind when psubst is     *)
 (*  used to implement nCicReduction.unwind'                             *)
-let rec psubst ?(avoid_beta_redexes=false) ?(no_implicit=true) map_arg args = 
+let rec psubst ?(avoid_beta_redexes=false) map_arg args = 
  let nargs = List.length args in
  let rec substaux k = function
    | C.Rel n as t ->
@@ -60,7 +59,7 @@ let rec psubst ?(avoid_beta_redexes=false) ?(no_implicit=true) map_arg args =
          if nargs <> 0 then C.Rel (n - nargs) else t
       | n when n < k -> t
       | n (* k <= n < k+nargs *) ->
-       (try lift ~no_implicit (k-1) (map_arg (List.nth args (n-k)))
+       (try lift (k-1) (map_arg (List.nth args (n-k)))
         with Failure _ | Invalid_argument _ -> assert false))
    | C.Meta (i,(m,l)) as t when m >= k + nargs - 1 -> 
        if nargs <> 0 then C.Meta (i,(m-nargs,l)) else t
@@ -68,11 +67,8 @@ let rec psubst ?(avoid_beta_redexes=false) ?(no_implicit=true) map_arg args =
    | C.Meta (i,(m,l)) -> 
       let lctx = NCicUtils.expand_local_context l in
        C.Meta (i,(0, 
-         C.Ctx (HExtlib.sharing_map 
-		  (fun x -> substaux k (lift ~no_implicit m x)) lctx)))
-   | C.Implicit _ as t -> 
-       if no_implicit then assert false (* was identity *)
-       else t
+         C.Ctx (HExtlib.sharing_map (fun x -> substaux k (lift m x)) lctx)))
+   | C.Implicit _ -> assert false (* was identity *)
    | C.Appl (he::tl) as t ->
       (* Invariant: no Appl applied to another Appl *)
       let rec avoid he' = function
@@ -84,8 +80,7 @@ let rec psubst ?(avoid_beta_redexes=false) ?(no_implicit=true) map_arg args =
                 (* map_arg is here \x.x, Obj magic is needed because 
                  * we don't have polymorphic recursion w/o records *)
                 avoid (psubst 
-                  ~avoid_beta_redexes ~no_implicit
-		  Obj.magic [Obj.magic arg] bo) tl'
+                  ~avoid_beta_redexes Obj.magic [Obj.magic arg] bo) tl'
             | _ -> if he == he' && args == tl then t else C.Appl (he'::args))
       in
       let tl = HExtlib.sharing_map (substaux k) tl in
@@ -95,8 +90,8 @@ let rec psubst ?(avoid_beta_redexes=false) ?(no_implicit=true) map_arg args =
   substaux 1
 ;;
 
-let subst ?avoid_beta_redexes ?no_implicit arg = 
-  psubst ?avoid_beta_redexes ?no_implicit(fun x -> x)[arg];;
+let subst ?avoid_beta_redexes arg = 
+  psubst ?avoid_beta_redexes (fun x -> x)[arg];;
 
 (* subst_meta (n, C.Ctx [t_1 ; ... ; t_n]) t                                 *)
 (*  returns the term [t] where [Rel i] is substituted with [t_i] lifted by n *)