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diff --git a/third_party/immer/test/box/gc.cpp b/third_party/immer/test/box/gc.cpp
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+++ b/third_party/immer/test/box/gc.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>
+#include <immer/heap/gc_heap.hpp>
+#include <immer/refcount/no_refcount_policy.hpp>
+
+using gc_memory = immer::memory_policy<immer::heap_policy<immer::gc_heap>,
+                                       immer::no_refcount_policy>;
+
+template <typename T>
+using test_box_t = immer::box<T, gc_memory>;
+
+#define BOX_T test_box_t
+#include "generic.ipp"