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+/*!
+@file
+Defines `boost::hana::when` and `boost::hana::when_valid`.
+
+@copyright Louis Dionne 2013-2016
+Distributed under the Boost Software License, Version 1.0.
+(See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
+ */
+
+#ifndef BOOST_HANA_CORE_WHEN_HPP
+#define BOOST_HANA_CORE_WHEN_HPP
+
+#include <boost/hana/fwd/core/when.hpp>
+
+#endif // !BOOST_HANA_CORE_WHEN_HPP