X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=components%2Ftactics%2Finversion.ml;h=e381b3003d7b4940eba1b0886c007922066211d0;hb=f9512e878bd27f8cb5261bb18b0da0d42c8184d0;hp=f5e2a847690f2b4c20544c32d9a18ba25108177c;hpb=801f0eb3eabe1cbcd66d6a3f52c24eb8f1189611;p=helm.git

diff --git a/components/tactics/inversion.ml b/components/tactics/inversion.ml
index f5e2a8476..e381b3003 100644
--- a/components/tactics/inversion.ml
+++ b/components/tactics/inversion.ml
@@ -171,6 +171,7 @@ let isSetType paramty = ((Pervasives.compare
   (get_sort_type paramty)
   (Cic.Sort Cic.Prop)) != 0) 
 
+exception EqualityNotDefinedYet
 let private_inversion_tac ~term =
  let module T = CicTypeChecker in
  let module R = CicReduction in
@@ -181,7 +182,11 @@ let private_inversion_tac ~term =
  
  (*DEBUG*) debug_print (lazy  ("private inversion begins"));
  let (_,metasenv,_,_) = proof in
- let uri_of_eq = LibraryObjects.eq_URI () in
+ let uri_of_eq =
+  match LibraryObjects.eq_URI () with
+     None -> raise EqualityNotDefinedYet
+  | Some uri -> uri
+ in
  let (_,context,goalty) = CicUtil.lookup_meta goal metasenv in
  let termty,_ = T.type_of_aux' metasenv context term CicUniv.empty_ugraph in
  let uri = baseuri_of_term termty in  
@@ -301,14 +306,17 @@ let inversion_tac ~term =
   let (_,metasenv,_,_) = proof in
   let (_,context,goalty) = CicUtil.lookup_meta goal metasenv in
   let termty,_ = T.type_of_aux' metasenv context term CicUniv.empty_ugraph in
-  let uri = baseuri_of_term termty in  
+  let uri, typeno = 
+    match termty with
+      | Cic.MutInd (uri,typeno,_) 
+      | Cic.Appl(Cic.MutInd (uri,typeno,_)::_) -> uri,typeno
+      | _ -> assert false
+  in
+  (* let uri = baseuri_of_term termty in *)
   let obj,_ = CicEnvironment.get_obj CicUniv.empty_ugraph uri in
   let name,nleft,arity,cons_list =
    match obj with
     Cic.InductiveDefinition (tys,_,nleft,_) ->
-     (*we suppose there is only one inductiveType in the definition, 
-     so typeno=0 identically *)
-     let typeno = 0 in
      let (name,_,arity,cons_list) = List.nth tys typeno in 
         (name,nleft,arity,cons_list)
    |_ -> assert false