#include <boost/hana/config.hpp>
-BOOST_HANA_NAMESPACE_BEGIN namespace detail {
+namespace boost { namespace hana { namespace detail {
template <typename ...>
using void_t = void;
-} BOOST_HANA_NAMESPACE_END
+} }} // end namespace boost::hana
#endif // !BOOST_HANA_DETAIL_VOID_T_HPP