From bb4982b896c7b96eef2f18ceab3d0b8e294e44d0 Mon Sep 17 00:00:00 2001
From: puech <puech@85f007b7-540e-0410-9357-904b9bb8a0f7>
Date: Fri, 29 Jul 2011 14:26:01 +0000
Subject: Heads: generic equality on constr replaced by destructor

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@14331 85f007b7-540e-0410-9357-904b9bb8a0f7
---
 library/heads.ml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'library/heads.ml')

diff --git a/library/heads.ml b/library/heads.ml
index 363443bbb..8fda452c1 100644
--- a/library/heads.ml
+++ b/library/heads.ml
@@ -146,7 +146,7 @@ let cache_head o =
 let subst_head_approximation subst = function
   | RigidHead (RigidParameter cst) as k ->
       let cst,c = subst_con subst cst in
-      if c = mkConst cst then
+      if isConst c && eq_constant (destConst c) cst then
         (* A change of the prefix of the constant *)
         k
       else
-- 
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