removed no longer used METAs

[helm.git] / helm / ocaml / cic_proof_checking / cicTypeChecker.ml

diff --git a/helm/ocaml/cic_proof_checking/cicTypeChecker.ml b/helm/ocaml/cic_proof_checking/cicTypeChecker.ml
index 611585400c69251e86d8b34b5ee8a67b1121e70d..951f68dbd84b28043a100fe3c72c114d4f5927a7 100644 (file)
--- a/helm/ocaml/cic_proof_checking/cicTypeChecker.ml
+++ b/helm/ocaml/cic_proof_checking/cicTypeChecker.ml
@@ -23,6 +23,8 @@
  * http://cs.unibo.it/helm/.
  *)
 
+(* $Id$ *)
+
 (* TODO factorize functions to frequent errors (e.g. "Unknwon mutual inductive
  * ...") *)
 
@@ -42,7 +44,7 @@ let debug t context =
    raise (TypeCheckerFailure (lazy (List.fold_right debug_aux (t::context) "")))
 ;;
 
-let debug_print = fun _ -> () ;;
+let debug_print = fun _ -> ();;
 
 let rec split l n =
  match (l,n) with
@@ -52,10 +54,11 @@ let rec split l n =
       raise (TypeCheckerFailure (lazy "Parameters number < left parameters number"))
 ;;
 
-let debrujin_constructor uri number_of_types =
- let rec aux k =
+let debrujin_constructor ?(cb=fun _ _ -> ()) uri number_of_types =
+ let rec aux k t =
   let module C = Cic in
-   function
+  let res =
+   match t with
       C.Rel n as t when n <= k -> t
     | C.Rel _ ->
         raise (TypeCheckerFailure (lazy "unbound variable found in constructor type"))
@@ -66,7 +69,7 @@ let debrujin_constructor uri number_of_types =
         C.Var (uri,exp_named_subst')
     | C.Meta (i,l) ->
        let l' = List.map (function None -> None | Some t -> Some (aux k t)) l in
-        C.Meta (i,l)
+        C.Meta (i,l')
     | C.Sort _
     | C.Implicit _ as t -> t
     | C.Cast (te,ty) -> C.Cast (aux k te, aux k ty)
@@ -114,6 +117,9 @@ let debrujin_constructor uri number_of_types =
           fl
        in
         C.CoFix (i, liftedfl)
+  in
+   cb t res;
+   res
  in
   aux 0
 ;;
@@ -545,7 +551,7 @@ and typecheck_mutual_inductive_defs ~logger uri (itl,_,indparamsno) ugraph =
                ugraph'
             ) ugraph cl in
        (i + 1),ugraph''
-      ) itl (1,ugraph)
+      ) itl (1,ugrap1)
   in
   ugraph2
 
@@ -1126,11 +1132,10 @@ and guarded_by_constructors ~subst context n nn h te args coInductiveTypeURI =
          | C.Lambda _
          | C.LetIn _ ->
             raise (AssertFailure (lazy "25"))(* due to type-checking *)
-         | C.Appl ((C.MutInd (uri,_,_))::_) as ty
-            when uri == coInductiveTypeURI -> 
+         | C.Appl ((C.MutInd (uri,_,_))::_) when uri == coInductiveTypeURI -> 
              guarded_by_constructors ~subst context n nn true te []
               coInductiveTypeURI
-         | C.Appl ((C.MutInd (uri,_,_))::_) as ty -> 
+         | C.Appl ((C.MutInd (uri,_,_))::_) -> 
             guarded_by_constructors ~subst context n nn true te tl
              coInductiveTypeURI
          | C.Appl _ ->
@@ -1308,7 +1313,7 @@ and check_allowed_sort_elimination ~subst ~metasenv ~logger context uri i
            let itl_len = List.length itl in
            let (name,_,ty,cl) = List.nth itl i in
            let cl_len = List.length cl in
-            if (itl_len = 1 && cl_len <= 1) then
+            if (cl_len = 0 || (itl_len = 1 && cl_len = 1)) then
              let non_informative,ugraph =
               if cl_len = 0 then true,ugraph
               else
@@ -1319,12 +1324,7 @@ and check_allowed_sort_elimination ~subst ~metasenv ~logger context uri i
                  definition? *)
               non_informative, ugraph
             else
-             let is_empty =
-              List.fold_left
-               (fun b (_,_,_,cl) -> b && List.length cl = 0) true itl
-             in
-              (* is it a block of mutual inductive empty definitions? *)
-              is_empty,ugraph
+              false,ugraph
          | _ ->
              raise (TypeCheckerFailure 
                     (lazy ("Unknown mutual inductive definition:" ^
@@ -1692,8 +1692,7 @@ and type_of_aux' ~logger ?(subst = []) metasenv context t ugraph =
                  (lazy (sprintf
                      ("Case analysys: analysed term type is %s (%s#1/%d{_}), but is expected to be (an application of) %s#1/%d{_}")
                      (CicPp.ppterm typ) (U.string_of_uri uri') i' (U.string_of_uri uri) i)))
-          | C.Appl 
-             ((C.MutInd (uri',i',exp_named_subst) as typ):: tl) as typ' ->
+          | C.Appl ((C.MutInd (uri',i',exp_named_subst) as typ):: tl) ->
               if U.eq uri uri' && i = i' then
                let params,args =
                  split tl (List.length tl - k)
@@ -2060,7 +2059,10 @@ let typecheck_obj0 ~logger uri ugraph =
       let b,ugraph = (CicReduction.are_convertible [] ty_te ty ugraph) in
        if not b then
          raise (TypeCheckerFailure
-          (lazy "the type of the body is not the one expected"))
+          (lazy
+            ("the type of the body is not the one expected:\n" ^
+             CicPp.ppterm ty_te ^ "\nvs\n" ^
+             CicPp.ppterm ty)))
        else
         ugraph
    | C.Constant (_,None,ty,_,_) ->