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diff --git a/src/boost/libs/hana/example/optional/comparable.cpp b/src/boost/libs/hana/example/optional/comparable.cpp
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+++ b/src/boost/libs/hana/example/optional/comparable.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/not_equal.hpp>
+#include <boost/hana/optional.hpp>
+namespace hana = boost::hana;
+
+
+BOOST_HANA_CONSTANT_CHECK(hana::nothing == hana::nothing);
+static_assert(hana::just('x') == hana::just('x'), "");
+static_assert(hana::just('x') != hana::just('y'), "");
+BOOST_HANA_CONSTANT_CHECK(hana::just('x') != hana::nothing);
+
+int main() { }