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diff --git a/third_party/immer/example/flex-vector/flex-vector.cpp b/third_party/immer/example/flex-vector/flex-vector.cpp
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index 000000000000..7c8a7793393c
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+++ b/third_party/immer/example/flex-vector/flex-vector.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/flex_vector.hpp>
+
+#include <cassert>
+
+int main()
+{
+    {
+        // include:push-back/start
+        auto v1 = immer::flex_vector<int>{1};
+        auto v2 = v1.push_back(8);
+
+        assert((v1 == immer::flex_vector<int>{1}));
+        assert((v2 == immer::flex_vector<int>{1, 8}));
+        // include:push-back/end
+    }
+    {
+        // include:push-front/start
+        auto v1 = immer::flex_vector<int>{1};
+        auto v2 = v1.push_front(8);
+
+        assert((v1 == immer::flex_vector<int>{1}));
+        assert((v2 == immer::flex_vector<int>{8, 1}));
+        // include:push-front/end
+    }
+
+    {
+        // include:set/start
+        auto v1 = immer::flex_vector<int>{1, 2, 3};
+        auto v2 = v1.set(0, 5);
+
+        assert((v1 == immer::flex_vector<int>{1, 2, 3}));
+        assert((v2 == immer::flex_vector<int>{5, 2, 3}));
+        // include:set/end
+    }
+
+    {
+        // include:update/start
+        auto v1 = immer::flex_vector<int>{1, 2, 3, 4};
+        auto v2 = v1.update(2, [&](auto l) { return ++l; });
+
+        assert((v1 == immer::flex_vector<int>{1, 2, 3, 4}));
+        assert((v2 == immer::flex_vector<int>{1, 2, 4, 4}));
+        // include:update/end
+    }
+
+    {
+        // include:take/start
+        auto v1 = immer::flex_vector<int>{1, 2, 3, 4, 5, 6};
+        auto v2 = v1.take(3);
+
+        assert((v1 == immer::flex_vector<int>{1, 2, 3, 4, 5, 6}));
+        assert((v2 == immer::flex_vector<int>{1, 2, 3}));
+        // include:take/end
+    }
+
+    {
+        // include:drop/start
+        auto v1 = immer::flex_vector<int>{1, 2, 3, 4, 5, 6};
+        auto v2 = v1.drop(3);
+
+        assert((v1 == immer::flex_vector<int>{1, 2, 3, 4, 5, 6}));
+        assert((v2 == immer::flex_vector<int>{4, 5, 6}));
+        // include:drop/end
+    }
+
+    {
+        // include:insert/start
+        auto v1 = immer::flex_vector<int>{1, 2, 3};
+        auto v2 = v1.insert(0, 0);
+
+        assert((v1 == immer::flex_vector<int>{1, 2, 3}));
+        assert((v2 == immer::flex_vector<int>{0, 1, 2, 3}));
+        // include:insert/end
+    }
+
+    {
+        // include:erase/start
+        auto v1 = immer::flex_vector<int>{1, 2, 3, 4, 5};
+        auto v2 = v1.erase(2);
+
+        assert((v1 == immer::flex_vector<int>{1, 2, 3, 4, 5}));
+        assert((v2 == immer::flex_vector<int>{1, 2, 4, 5}));
+        // include:erase/end
+    }
+
+    {
+        // include:concat/start
+        auto v1 = immer::flex_vector<int>{1, 2, 3};
+        auto v2 = v1 + v1;
+
+        assert((v1 == immer::flex_vector<int>{1, 2, 3}));
+        assert((v2 == immer::flex_vector<int>{1, 2, 3, 1, 2, 3}));
+        // include:concat/end
+    }
+}