1 // Copyright Louis Dionne 2013-2017
2 // Distributed under the Boost Software License, Version 1.0.
3 // (See accompanying file LICENSE.md or copy at http://boost.org/LICENSE_1_0.txt)
4 
5 #include <boost/hana/assert.hpp>
6 #include <boost/hana/empty.hpp>
7 #include <boost/hana/equal.hpp>
8 #include <boost/hana/optional.hpp>
9 namespace hana = boost::hana;
10 
11 
main()12 int main() {
13     BOOST_HANA_CONSTANT_CHECK(hana::equal(
14         hana::empty<hana::optional_tag>(),
15         hana::nothing
16     ));
17 }
18