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diff --git a/src/third_party/boost-1.69.0/boost/multi_index/key_extractors.hpp b/src/third_party/boost-1.69.0/boost/multi_index/key_extractors.hpp
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+++ b/src/third_party/boost-1.69.0/boost/multi_index/key_extractors.hpp
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+/* Copyright 2003-2013 Joaquin M Lopez Munoz.
+ * Distributed under the Boost Software License, Version 1.0.
+ * (See accompanying file LICENSE_1_0.txt or copy at
+ * http://www.boost.org/LICENSE_1_0.txt)
+ *
+ * See http://www.boost.org/libs/multi_index for library home page.
+ */
+
+#ifndef BOOST_MULTI_INDEX_KEY_EXTRACTORS_HPP
+#define BOOST_MULTI_INDEX_KEY_EXTRACTORS_HPP
+
+#if defined(_MSC_VER)
+#pragma once
+#endif
+
+#include <boost/multi_index/composite_key.hpp>
+#include <boost/multi_index/identity.hpp>
+#include <boost/multi_index/global_fun.hpp>
+#include <boost/multi_index/member.hpp>
+#include <boost/multi_index/mem_fun.hpp>
+
+#endif