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diff --git a/third_party/immer/test/experimental/dvektor.cpp b/third_party/immer/test/experimental/dvektor.cpp
new file mode 100644
index 000000000000..437384a72771
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+++ b/third_party/immer/test/experimental/dvektor.cpp
@@ -0,0 +1,198 @@
+//
+// 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/experimental/dvektor.hpp>
+
+#include <boost/range/adaptors.hpp>
+
+#include <algorithm>
+#include <numeric>
+#include <vector>
+#include <iostream>
+
+#include <doctest.h>
+
+using namespace immer;
+
+TEST_CASE("instantiation")
+{
+    auto v = dvektor<int>{};
+    CHECK(v.size() == 0u);
+}
+
+TEST_CASE("push back one element")
+{
+    SUBCASE("one element")
+    {
+        const auto v1 = dvektor<int>{};
+        auto v2       = v1.push_back(42);
+        CHECK(v1.size() == 0u);
+        CHECK(v2.size() == 1u);
+        CHECK(v2[0] == 42);
+    }
+
+    SUBCASE("many elements")
+    {
+        const auto n = 666u;
+        auto v       = dvektor<unsigned>{};
+        for (auto i = 0u; i < n; ++i) {
+            v = v.push_back(i * 10);
+            CHECK(v.size() == i + 1);
+            for (auto j = 0u; j < v.size(); ++j)
+                CHECK(i + v[j] == i + j * 10);
+        }
+    }
+}
+
+TEST_CASE("update")
+{
+    const auto n = 42u;
+    auto v       = dvektor<unsigned>{};
+    for (auto i = 0u; i < n; ++i)
+        v = v.push_back(i);
+
+    SUBCASE("assoc")
+    {
+        const auto u = v.assoc(3u, 13u);
+        CHECK(u.size() == v.size());
+        CHECK(u[2u] == 2u);
+        CHECK(u[3u] == 13u);
+        CHECK(u[4u] == 4u);
+        CHECK(u[40u] == 40u);
+        CHECK(v[3u] == 3u);
+    }
+
+    SUBCASE("assoc further")
+    {
+        for (auto i = n; i < 666; ++i)
+            v = v.push_back(i);
+
+        auto u = v.assoc(3u, 13u);
+        u      = u.assoc(200u, 7u);
+        CHECK(u.size() == v.size());
+
+        CHECK(u[2u] == 2u);
+        CHECK(u[4u] == 4u);
+        CHECK(u[40u] == 40u);
+        CHECK(u[600u] == 600u);
+
+        CHECK(u[3u] == 13u);
+        CHECK(u[200u] == 7u);
+
+        CHECK(v[3u] == 3u);
+        CHECK(v[200u] == 200u);
+    }
+
+    SUBCASE("assoc further more")
+    {
+        auto v = immer::dvektor<unsigned, 4>{};
+
+        for (auto i = n; i < 1000u; ++i)
+            v = v.push_back(i);
+
+        for (auto i = 0u; i < v.size(); ++i) {
+            v = v.assoc(i, i + 1);
+            CHECK(v[i] == i + 1);
+        }
+    }
+
+    SUBCASE("update")
+    {
+        const auto u = v.update(10u, [](auto x) { return x + 10; });
+        CHECK(u.size() == v.size());
+        CHECK(u[10u] == 20u);
+        CHECK(v[40u] == 40u);
+
+        const auto w = v.update(40u, [](auto x) { return x - 10; });
+        CHECK(w.size() == v.size());
+        CHECK(w[40u] == 30u);
+        CHECK(v[40u] == 40u);
+    }
+}
+
+#if IMMER_SLOW_TESTS
+TEST_CASE("big")
+{
+    const auto n = 1000000;
+    auto v       = dvektor<unsigned>{};
+    for (auto i = 0u; i < n; ++i)
+        v = v.push_back(i);
+
+    SUBCASE("read")
+    {
+        for (auto i = 0u; i < n; ++i)
+            CHECK(v[i] == i);
+    }
+
+    SUBCASE("assoc")
+    {
+        for (auto i = 0u; i < n; ++i) {
+            v = v.assoc(i, i + 1);
+            CHECK(v[i] == i + 1);
+        }
+    }
+}
+#endif // IMMER_SLOW_TESTS
+
+TEST_CASE("iterator")
+{
+    const auto n = 666u;
+    auto v       = dvektor<unsigned>{};
+    for (auto i = 0u; i < n; ++i)
+        v = v.push_back(i);
+
+    SUBCASE("works with range loop")
+    {
+        auto i = 0u;
+        for (const auto& x : v)
+            CHECK(x == i++);
+        CHECK(i == v.size());
+    }
+
+    SUBCASE("works with standard algorithms")
+    {
+        auto s = std::vector<unsigned>(n);
+        std::iota(s.begin(), s.end(), 0u);
+        std::equal(v.begin(), v.end(), s.begin(), s.end());
+    }
+
+    SUBCASE("can go back from end") { CHECK(n - 1 == *--v.end()); }
+
+    SUBCASE("works with reversed range adaptor")
+    {
+        auto r = v | boost::adaptors::reversed;
+        auto i = n;
+        for (const auto& x : r)
+            CHECK(x == --i);
+    }
+
+    SUBCASE("works with strided range adaptor")
+    {
+        auto r = v | boost::adaptors::strided(5);
+        auto i = 0u;
+        for (const auto& x : r)
+            CHECK(x == 5 * i++);
+    }
+
+    SUBCASE("works reversed")
+    {
+        auto i = n;
+        for (auto iter = v.rbegin(), last = v.rend(); iter != last; ++iter)
+            CHECK(*iter == --i);
+    }
+
+    SUBCASE("advance and distance")
+    {
+        auto i1 = v.begin();
+        auto i2 = i1 + 100;
+        CHECK(*i2 == 100u);
+        CHECK(i2 - i1 == 100);
+        CHECK(*(i2 - 50) == 50u);
+        CHECK((i2 - 30) - i2 == -30);
+    }
+}