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diff --git a/src/boost/libs/hana/example/wandbox.cpp b/src/boost/libs/hana/example/wandbox.cpp
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+// Copyright Louis Dionne 2013-2017
+// Distributed under the Boost Software License, Version 1.0.
+// (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
+
+#include <boost/hana.hpp>
+
+#include <functional>
+#include <iostream>
+#include <string>
+#include <type_traits>
+#include <utility>
+namespace hana = boost::hana;
+using namespace hana::literals;
+using namespace std::literals;
+
+
+//////////////////////////////////////////////////////////////////////////////
+// Welcome to Hana!
+//
+// You can play around and press 'Run' at the bottom of this file to compile
+// and run this code.
+//
+// To get you started, here's a small JSON generator written with Hana
+// (this is explained in the tutorial if you're interested):
+//////////////////////////////////////////////////////////////////////////////
+
+// 1. Define some utilities
+template <typename Xs>
+std::string join(Xs&& xs, std::string sep) {
+  return hana::fold(hana::intersperse(std::forward<Xs>(xs), sep), "", std::plus<>{});
+}
+
+std::string quote(std::string s) { return "\"" + s + "\""; }
+
+template <typename T>
+auto to_json(T const& x) -> decltype(std::to_string(x)) {
+  return std::to_string(x);
+}
+
+std::string to_json(char c) { return quote({c}); }
+std::string to_json(std::string s) { return quote(s); }
+
+
+// 2. Define how to print user-defined types
+template <typename T>
+  std::enable_if_t<hana::Struct<T>::value,
+std::string> to_json(T const& x) {
+  auto json = hana::transform(hana::keys(x), [&](auto name) {
+    auto const& member = hana::at_key(x, name);
+    return quote(hana::to<char const*>(name)) + " : " + to_json(member);
+  });
+
+  return "{" + join(std::move(json), ", ") + "}";
+}
+
+// 3. Define how to print Sequences
+template <typename Xs>
+  std::enable_if_t<hana::Sequence<Xs>::value,
+std::string> to_json(Xs const& xs) {
+  auto json = hana::transform(xs, [](auto const& x) {
+    return to_json(x);
+  });
+
+  return "[" + join(std::move(json), ", ") + "]";
+}
+
+
+// 4. Create your own types and make them compatible with Hana.
+//    This can be done intrusively or non-intrusively.
+struct Car {
+  BOOST_HANA_DEFINE_STRUCT(Car,
+    (std::string, brand),
+    (std::string, model)
+  );
+};
+
+int main() {
+  // 5. Generate beautiful JSON without hassle. Enjoy!
+  auto cars = hana::make_tuple(
+    Car{"BMW", "Z3"},
+    Car{"Audi", "A4"},
+    Car{"Ferrari", "F40"},
+    Car{"Lamborghini", "Diablo"}
+    // ...
+  );
+
+  std::cout << to_json(cars) << std::endl;
+}