From 45141987acc8069448a4fe4e0c22af81d3f7f669 Mon Sep 17 00:00:00 2001
From: puech
Date: Mon, 28 Nov 2011 17:00:49 +0000
Subject: Term: Fix hash_constr behavior for Cast lnterleaved in application
 spines.

hash_constr should give the same hash to two terms differing only by the presence of Casts.
It should now make the same quotients on terms than constr_ord or equals_constr.
This handles the case of App(Cast(App(f, l1), _, a), l2).

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@14735 85f007b7-540e-0410-9357-904b9bb8a0f7
---
 kernel/term.ml | 1 +
 1 file changed, 1 insertion(+)

(limited to 'kernel')

diff --git a/kernel/term.ml b/kernel/term.ml
index 513573b8a2..d29f467a28 100644
--- a/kernel/term.ml
+++ b/kernel/term.ml
@@ -1359,6 +1359,7 @@ let rec hash_constr t =
     | Lambda (_, t, c) -> combinesmall 5 (combine (hash_constr t) (hash_constr c))
     | LetIn (_, b, t, c) ->
       combinesmall 6 (combine3 (hash_constr b) (hash_constr t) (hash_constr c))
+    | App (c,l) when isCast c -> hash_constr (mkApp (pi1 (destCast c),l))
     | App (c,l) ->
       combinesmall 7 (combine (hash_term_array l) (hash_constr c))
     | Evar (e,l) ->
-- 
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