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diff --git a/third_party/immer/test/box/recursive.cpp b/third_party/immer/test/box/recursive.cpp
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+++ b/third_party/immer/test/box/recursive.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/algorithm.hpp>
+#include <immer/box.hpp>
+#include <immer/flex_vector.hpp>
+#include <immer/map.hpp>
+#include <immer/set.hpp>
+#include <immer/vector.hpp>
+
+#include <catch.hpp>
+
+struct rec_vec
+{
+    int data;
+    immer::vector<immer::box<rec_vec>> children;
+};
+
+TEST_CASE("recursive vector")
+{
+    auto v1 = rec_vec{42,
+                      {rec_vec{12, {}},
+                       rec_vec{13, {rec_vec{5, {}}, rec_vec{7, {}}}},
+                       rec_vec{15, {}}}};
+    CHECK(v1.data == 42);
+    CHECK(v1.children[0]->data == 12);
+    CHECK(v1.children[1]->children[0]->data == 5);
+}
+
+struct rec_fvec
+{
+    int data;
+    immer::flex_vector<immer::box<rec_fvec>> children;
+};
+
+TEST_CASE("recursive flex_vector")
+{
+    auto v1 = rec_fvec{42,
+                       {rec_fvec{12, {}},
+                        rec_fvec{13, {rec_fvec{5, {}}, rec_fvec{7, {}}}},
+                        rec_fvec{15, {}}}};
+    CHECK(v1.data == 42);
+    CHECK(v1.children[0]->data == 12);
+    CHECK(v1.children[1]->children[0]->data == 5);
+}
+
+struct rec_map
+{
+    int data;
+    immer::map<std::string, immer::box<rec_map>> children;
+};
+
+TEST_CASE("recursive map")
+{
+    auto v1 = rec_map{42, {}};
+    auto v2 = rec_map{43, v1.children.set("hello", rec_map{12, {}})};
+    auto v3 = rec_map{44, v2.children.set("world", rec_map{13, {}})};
+
+    CHECK(v3.data == 44);
+    CHECK(v3.children["hello"]->data == 12);
+    CHECK(v3.children["world"]->data == 13);
+}
+
+struct rec_set
+{
+    int data;
+    immer::set<immer::box<rec_set>> children;
+
+    bool operator==(const rec_set& other) const
+    {
+        return data == other.data && children == other.children;
+    }
+    bool operator!=(const rec_set& other) const { return !(*this == other); }
+};
+
+namespace std {
+
+template <>
+struct hash<rec_set>
+{
+    auto operator()(const rec_set& s)
+    {
+        return std::hash<decltype(s.data)>{}(s.data) ^
+               immer::accumulate(
+                   s.children, std::size_t{}, [](auto ac, auto v) {
+                       return std::hash<decltype(v)>{}(v);
+                   });
+    }
+};
+
+} // namespace std
+
+TEST_CASE("recursive set")
+{
+    auto v1 = rec_set{42, {}};
+    auto v2 = rec_set{43, v1.children.insert(rec_set{12, {}})};
+    auto v3 = rec_set{44, v2.children.insert(rec_set{13, {}})};
+
+    CHECK(v3.data == 44);
+    CHECK(v3.children.count(rec_set{12, {}}) == 1);
+    CHECK(v3.children.count(rec_set{13, {}}) == 1);
+    CHECK(v3.children.count(rec_set{14, {}}) == 0);
+}