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diff --git a/test/box/default.cpp b/test/box/default.cpp
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+++ b/test/box/default.cpp
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+//
+// immer: immutable data structures for C++
+// Copyright (C) 2016, 2017, 2018 Juan Pedro Bolivar Puente
+//
+// This software is distributed under the Boost Software License, Version 1.0.
+// See accompanying file LICENSE or copy at http://boost.org/LICENSE_1_0.txt
+//
+
+#include <immer/box.hpp>
+
+#define BOX_T ::immer::box
+#include "generic.ipp"