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diff --git a/src/boost/libs/hana/example/optional/value.cpp b/src/boost/libs/hana/example/optional/value.cpp
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+++ b/src/boost/libs/hana/example/optional/value.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/assert.hpp>
+#include <boost/hana/equal.hpp>
+#include <boost/hana/optional.hpp>
+#include <boost/hana/type.hpp>
+
+#include <string>
+namespace hana = boost::hana;
+
+
+int main() {
+    static_assert(hana::just('x').value() == 'x', "");
+    BOOST_HANA_CONSTANT_CHECK(*hana::just(hana::type_c<int>) == hana::type_c<int>);
+    BOOST_HANA_RUNTIME_CHECK(hana::just(std::string{"abcd"})->size() == 4);
+
+    // hana::nothing.value(); // compile-time error
+}