From 9b61b18eaac41b6f2bc5e5eb00dc0021f1202af1 Mon Sep 17 00:00:00 2001
From: Leonardo de Moura <leonardo@microsoft.com>
Date: Tue, 23 Sep 2014 15:26:05 -0700
Subject: [PATCH] perf(kernel/replace_visitor): use more expensive/precise
 cache

It does not use pointer equality, but structural equality
---
 src/kernel/replace_visitor.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/kernel/replace_visitor.h b/src/kernel/replace_visitor.h
index a0dd57608c..bfe389e2ea 100644
--- a/src/kernel/replace_visitor.h
+++ b/src/kernel/replace_visitor.h
@@ -16,7 +16,7 @@ namespace lean {
 */
 class replace_visitor {
 protected:
-    typedef expr_map<expr> cache;
+    typedef expr_bi_struct_map<expr> cache;
     cache   m_cache;
     expr save_result(expr const & e, expr && r, bool shared);
     virtual expr visit_sort(expr const &);