From: Claudio Sacerdoti Coen <claudio.sacerdoticoen@unibo.it>
Date: Mon, 12 Oct 2009 17:04:46 +0000 (+0000)
Subject: Bug fixed: in case of (t ...) where t has flexible type, a failure obtained
X-Git-Tag: make_still_working~3332
X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=commitdiff_plain;h=34c2ba63c8eb5fccfd9a1fb8ac1df5895c8b58b3;p=helm.git

Bug fixed: in case of (t ...) where t has flexible type, a failure obtained
without extending ... (since this could cause divergence) should be considered
an uncertain (since extension may be necessary).
---

diff --git a/helm/software/components/ng_refiner/nCicRefiner.ml b/helm/software/components/ng_refiner/nCicRefiner.ml
index b88e261f1..ac280e81f 100644
--- a/helm/software/components/ng_refiner/nCicRefiner.ml
+++ b/helm/software/components/ng_refiner/nCicRefiner.ml
@@ -537,7 +537,10 @@ and eat_prods rdb ~localise force_ty metasenv subst context expty orig_t orig_he
            aux metasenv subst args_so_far he ty_he
             (NCic.Implicit `Term :: NCic.Implicit `Vector :: tl)
           with
-           Uncertain msg | RefineFailure msg -> raise (wrap_exc msg exc)))
+           Uncertain msg | RefineFailure msg -> raise (wrap_exc msg exc))
+     | RefineFailure msg when not (has_some_more_pis ty_he) ->
+        (* instantiating the head could change the has_some_more_pis flag *)
+        raise (Uncertain msg))
   | arg::tl ->
       match NCicReduction.whd ~subst context ty_he with 
       | C.Prod (_,s,t) ->