X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Fng_refiner%2FnCicUnification.ml;h=fcc76b0adc5bf72b38129bd36a3ddca7952d4676;hb=a0b7db9844126ebcdf4b5dbb586514854cef5d93;hp=dd1e4b80c520b71e6d96b0e915f98f86e3716659;hpb=3b4ec24b0bf7b1cd23cdc632fa3fcbb9dbbda139;p=helm.git

diff --git a/helm/software/components/ng_refiner/nCicUnification.ml b/helm/software/components/ng_refiner/nCicUnification.ml
index dd1e4b80c..fcc76b0ad 100644
--- a/helm/software/components/ng_refiner/nCicUnification.ml
+++ b/helm/software/components/ng_refiner/nCicUnification.ml
@@ -382,8 +382,8 @@ let rec instantiate rdb test_eq_only metasenv subst context n lc t swap =
        | _ ->
         let lty = NCicSubstitution.subst_meta lc ty in
         pp (lazy ("On the types: " ^
-          ppterm ~metasenv ~subst ~context lty ^ "=<=" ^
-          ppterm ~metasenv ~subst ~context ty_t)); 
+          ppterm ~metasenv ~subst ~context ty_t ^ "=<=" ^
+          ppterm ~metasenv ~subst ~context lty)); 
         let metasenv, subst = 
           unify rdb false metasenv subst context ty_t lty false
         in
@@ -559,6 +559,17 @@ and unify rdb test_eq_only metasenv subst context t1 t2 swap =
               len2 < len1 && cc2 = fst (HExtlib.split_nth len2 cc1) ->
           instantiate rdb test_eq_only metasenv subst context m lc'
             (NCicReduction.head_beta_reduce ~subst t1) (not swap)
+       | C.Meta (n,lc), C.Meta (m,lc') when
+          let _,_,tyn = NCicUtils.lookup_meta n metasenv in
+          let _,_,tym = NCicUtils.lookup_meta m metasenv in
+          let tyn = NCicSubstitution.subst_meta lc tyn in
+          let tym = NCicSubstitution.subst_meta lc tym in
+           match tyn,tym with
+              NCic.Sort NCic.Type u1, NCic.Sort NCic.Type u2 ->
+               NCicEnvironment.universe_lt u1 u2
+            | _,_ -> false ->
+          instantiate rdb test_eq_only metasenv subst context m lc'
+            (NCicReduction.head_beta_reduce ~subst t1) (not swap)
        | C.Meta (n,lc), t -> 
           instantiate rdb test_eq_only metasenv subst context n lc 
             (NCicReduction.head_beta_reduce ~subst t) swap
@@ -575,17 +586,21 @@ and unify rdb test_eq_only metasenv subst context t1 t2 swap =
             * function even in the easy case above *)
            let easy_case = 
              match t2 with
-             | NCic.Appl (f :: f_args)  
-               when List.length args = List.length f_args && 
+             | NCic.Appl (f :: f_args)
+               when 
                List.exists (NCicMetaSubst.is_flexible context ~subst) args ->
+                let mlen = List.length args in
+                let flen = List.length f_args in
+                let min_len = min mlen flen in
+                let mhe,margs = HExtlib.split_nth (mlen - min_len) args in
+                let fhe,fargs = HExtlib.split_nth (flen - min_len) f_args in
                  (try 
-                    let metasenv, subst = 
-                      unify rdb test_eq_only metasenv subst context meta f swap
-                    in
                     Some (List.fold_left2 
                       (fun (m, s) t1 t2 -> 
-                        unify rdb test_eq_only m s context t1 t2 swap)
-                        (metasenv, subst) args f_args)
+                        unify rdb test_eq_only m s context t1 t2 swap
+                      ) (metasenv,subst)
+                        ((NCicUntrusted.mk_appl meta mhe)::margs)
+                        ((NCicUntrusted.mk_appl f fhe)::fargs))
                   with UnificationFailure _ | Uncertain _ | KeepReducing _ ->
                     None) 
              | _ -> None
@@ -861,7 +876,7 @@ and unify rdb test_eq_only metasenv subst context t1 t2 swap =
          | KeepReducing _ -> assert false
          | KeepReducingThis _ ->
             assert (not (norm1 && norm2));
-	    unif_machines metasenv subst (small_delta_step ~subst m1 m2)
+            unif_machines metasenv subst (small_delta_step ~subst m1 m2)
          | UnificationFailure _ | Uncertain _ when (not (norm1 && norm2))
            -> unif_machines metasenv subst (small_delta_step ~subst m1 m2)
          | UnificationFailure msg