X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Flambda-delta%2Fbasic_ag%2FbagReduction.ml;h=f8fed7786f22fe504585f76827e06b0143a5afe1;hb=ae63e62aaf5659fe6b0e48cc4a4bdcf7b57318ad;hp=ca22c1dbc3f44beccf5aa05d6a9debef3cb5eb96;hpb=fc15ad45208cc2e649fa435e547ecc757fe28481;p=helm.git

diff --git a/helm/software/lambda-delta/basic_ag/bagReduction.ml b/helm/software/lambda-delta/basic_ag/bagReduction.ml
index ca22c1dbc..f8fed7786 100644
--- a/helm/software/lambda-delta/basic_ag/bagReduction.ml
+++ b/helm/software/lambda-delta/basic_ag/bagReduction.ml
@@ -39,6 +39,8 @@ type ho_whd_result =
 
 type ac_result = (int * NUri.uri * Bag.term list) list option
 
+type extension = No | NSI
+
 (* Internal functions *******************************************************)
 
 let term_of_whdr = function
@@ -117,6 +119,8 @@ let insert f i uri vs = function
 
 (* Interface functions ******************************************************)
 
+let ext = ref No
+
 let rec ho_whd f c m x =
    let aux m = function
       | Sort_ h                  -> f (Sort h)
@@ -124,13 +128,13 @@ let rec ho_whd f c m x =
          let f w = f (Abst w) in unwind_to_term f m w
       | LRef_ (_, Some w)        -> ho_whd f c m w
       | GRef_ (_, uri, B.Abst w) -> 
-         let f = function 
+         let h = function 
 	    | Abst _ as r -> f r 
 	    | GRef _ as r -> f r
 	    | Sort _      ->
 	       let f vs = f (GRef (uri, vs)) in unwind_stack f m
 	 in
-	 ho_whd f c m w
+	 if !ext = No then ho_whd h c m w else ho_whd f c m w 
       | GRef_ (_, _, B.Abbr v)   -> ho_whd f c m v
       | LRef_ (_, None)          -> assert false
       | GRef_ (_, _, B.Void)     -> assert false
@@ -164,18 +168,22 @@ let rec are_convertible f xl c m1 t1 m2 t2 =
       | Bind_ (l1, id1, w1, t1), Bind_ (l2, id2, w2, t2)   ->
          let f xl =
 	    let h c =
-	       let m1, m2 = inc m1, inc m2 in
+ 	       let m1, m2 = inc m1, inc m2 in
 	       S.subst (are_convertible f xl c m1 t1 m2) l1 l2 t2
 	    in
             if xl = None then f xl else push h c m1 l1 id1 w1
 	 in
 	 are_convertible f xl c m1 w1 m2 w2
 (* we detect the AUT-QE reduction rule for type/prop inclusion *)      
-      | GRef_ (_, uri, B.Abst _), Bind_ (l1, _, _, _)      ->
+      | GRef_ (_, uri, B.Abst _), Bind_ (l1, _, _, _) when !ext = No ->
          let g vs = insert f l1 uri vs xl in
 	 if U.eq uri I.imp then unwind_stack g m1 else 
 	 if U.eq uri I.all then unwind_stack g m1 else
 	 begin L.warn (U.string_of_uri uri); f None end
+      | Sort_ _, Bind_ (l2, id2, w2, t2)  when !ext = NSI  ->
+ 	 let m1, m2 = inc m1, inc m2 in
+	 let f c = are_convertible f xl c m1 (term_of_whdr r1) m2 t2 in
+	 push f c m2 l2 id2 w2
       | _                                                  -> f None
    and aux_rev m2 r2 m1 r1 = aux m1 r1 m2 r2 in
    let f m1 r1 = whd (aux m1 r1) c m2 t2 in