From 422943b59c046b00e4726c18163eeec62f4a82fb Mon Sep 17 00:00:00 2001
From: Claudio Sacerdoti Coen <claudio.sacerdoticoen@unibo.it>
Date: Tue, 10 Feb 2004 12:07:08 +0000
Subject: [PATCH] Bug fixed: checking inductive type declarations with left
 parameters (e.g. le) lead to mistakes due to debrujin/undebrujin: terms to be
 debrujined must be closed and then left parameters can not be removed
 _before_ calling debrujin_constructor.

---
 .../cic_proof_checking/cicTypeChecker.ml      | 41 ++++++++++---------
 1 file changed, 22 insertions(+), 19 deletions(-)

diff --git a/helm/ocaml/cic_proof_checking/cicTypeChecker.ml b/helm/ocaml/cic_proof_checking/cicTypeChecker.ml
index 9c9c0e58c..3f504ab79 100644
--- a/helm/ocaml/cic_proof_checking/cicTypeChecker.ml
+++ b/helm/ocaml/cic_proof_checking/cicTypeChecker.ml
@@ -604,13 +604,16 @@ and get_new_safes context p c rl safes n nn x =
    | (C.Prod _, (C.Rel _ as e), _)
    | (C.MutInd _, e, [])
    | (C.Appl _, e, []) -> (e,safes,n,nn,x,context)
-   | (_,_,_) ->
+   | (c,p,l) ->
       (* CSC: If the next exception is raised, it just means that   *)
       (* CSC: the proof-assistant allows to use very strange things *)
       (* CSC: as a branch of a case whose type is a Prod. In        *)
       (* CSC: particular, this means that a new (C.Prod, x,_) case  *)
       (* CSC: must be considered in this match. (e.g. x = MutCase)  *)
-      raise (AssertFailure "7")
+      raise
+       (AssertFailure
+         (Printf.sprintf "Get New Safes: c=%s ; p=%s"
+           (CicPp.ppterm c) (CicPp.ppterm p)))
 
 and split_prods context n te =
  let module C = Cic in
@@ -841,17 +844,21 @@ and guarded_by_destructors context n nn kl x safes =
            let (tys,len,isinductive,paramsno,cl) =
             match CicEnvironment.get_obj uri with
                C.InductiveDefinition (tl,_,paramsno) ->
-                let (_,isinductive,_,cl) = List.nth tl i in
-                 let tys =
-                  List.map (fun (n,_,ty,_) ->
-                   Some(Cic.Name n,(Cic.Decl ty))) tl
-                 in
-                  let cl' =
-                   List.map
-                    (fun (id,ty) ->
-                      (id, snd (split_prods tys paramsno ty))) cl
+                let len = List.length tl in
+                 let (_,isinductive,_,cl) = List.nth tl i in
+                  let tys =
+                   List.map (fun (n,_,ty,_) ->
+                    Some(Cic.Name n,(Cic.Decl ty))) tl
                   in
-                   (tys,List.length tl,isinductive,paramsno,cl')
+                   let cl' =
+                    List.map
+                     (fun (id,ty) ->
+                      let debrujinedty = debrujin_constructor uri len ty in
+                       (id, snd (split_prods tys paramsno ty),
+                        snd (split_prods tys paramsno debrujinedty)
+                       )) cl
+                   in
+                    (tys,len,isinductive,paramsno,cl')
              | _ ->
                 raise (TypeCheckerFailure
                   ("Unknown mutual inductive definition:" ^
@@ -869,11 +876,8 @@ and guarded_by_destructors context n nn kl x safes =
              guarded_by_destructors context n nn kl x safes outtype &&
               (*CSC: manca ??? il controllo sul tipo di term? *)
               List.fold_right
-               (fun (p,(_,c)) i ->
-                 let rl' =
-                  let debrujinedte = debrujin_constructor uri len c in
-                   recursive_args tys 0 len debrujinedte
-                 in
+               (fun (p,(_,c,brujinedc)) i ->
+                 let rl' = recursive_args tys 0 len brujinedc in
                   let (e,safes',n',nn',x',context') =
                    get_new_safes context p c rl' safes n nn x
                   in
@@ -1338,8 +1342,7 @@ and type_of_aux' metasenv context t =
 	  | None -> raise (TypeCheckerFailure "Reference to deleted hypothesis")
         with
         _ ->
-          raise (TypeCheckerFailure
-            "unbound variable found in constructor type")
+          raise (TypeCheckerFailure "unbound variable")
        )
     | C.Var (uri,exp_named_subst) ->
       incr fdebug ;
-- 
2.39.2