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diff --git a/boost/python/tag.hpp b/boost/python/tag.hpp
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+// Copyright David Abrahams 2002.
+// 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)
+#ifndef TAG_DWA2002720_HPP
+# define TAG_DWA2002720_HPP
+
+# include <boost/python/detail/prefix.hpp>
+
+namespace boost { namespace python { 
+
+// used only to prevent argument-dependent lookup from finding the
+// wrong function in some cases. Cheaper than qualification.
+enum tag_t { tag };
+
+}} // namespace boost::python
+
+#endif // TAG_DWA2002720_HPP