From 27a7627fe5f9b3d3715abb133229ebc446dd983b Mon Sep 17 00:00:00 2001
From: herbelin
Date: Tue, 20 Jan 2009 20:02:39 +0000
Subject: Fixing bug #1918 (no occur-check in Meta unification was done yet!).

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@11818 85f007b7-540e-0410-9357-904b9bb8a0f7
---
 pretyping/unification.ml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'pretyping')

diff --git a/pretyping/unification.ml b/pretyping/unification.ml
index 6c7ca8af2c..102d918fb7 100644
--- a/pretyping/unification.ml
+++ b/pretyping/unification.ml
@@ -190,7 +190,7 @@ let unify_0_with_initial_metas subst conv_at_top env sigma cv_pb flags m n =
 	    then (k1,cN,stN)::metasubst,evarsubst
 	    else if k1 = k2 then substn
 	    else (k2,cM,stM)::metasubst,evarsubst
-	| Meta k, _    -> 
+	| Meta k, _ when not (dependent cM cN) -> 
 	    (* Here we check that [cN] does not contain any local variables *)
 	    if nb = 0 then
               (k,cN,snd (extract_instance_status pb))::metasubst,evarsubst
@@ -198,7 +198,7 @@ let unify_0_with_initial_metas subst conv_at_top env sigma cv_pb flags m n =
               (k,lift (-nb) cN,snd (extract_instance_status pb))::metasubst,
               evarsubst
 	    else error_cannot_unify_local curenv sigma (m,n,cN)
-	| _, Meta k    -> 
+	| _, Meta k when not (dependent cN cM) -> 
 	    (* Here we check that [cM] does not contain any local variables *)
 	    if nb = 0 then
               (k,cM,snd (extract_instance_status pb))::metasubst,evarsubst
-- 
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