From: Enrico Tassi <enrico.tassi@inria.fr>
Date: Wed, 30 Jul 2008 15:19:04 +0000 (+0000)
Subject: allowed sort elim now check for recursive types
X-Git-Tag: make_still_working~4870
X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=commitdiff_plain;ds=sidebyside;h=190c0efe22d097c4b4e85207342224622b1fccb9;p=helm.git

allowed sort elim now check for recursive types
---

diff --git a/helm/software/components/cic_proof_checking/cicTypeChecker.ml b/helm/software/components/cic_proof_checking/cicTypeChecker.ml
index fa24119b3..111d20126 100644
--- a/helm/software/components/cic_proof_checking/cicTypeChecker.ml
+++ b/helm/software/components/cic_proof_checking/cicTypeChecker.ml
@@ -1179,7 +1179,9 @@ and check_allowed_sort_elimination ~subst ~metasenv ~logger context uri i
              in
               (* is it a singleton or empty non recursive and non informative
                  definition? *)
-              non_informative, ugraph
+              non_informative &&
+               does_not_occur [Some (C.Name name,C.Decl ty)] 0 1
+                (debrujin_constructor uri 1 [] (snd (List.nth cl 0))), ugraph
             else
               false,ugraph
          | _ ->