1 files changed, 55 insertions, 0 deletions
diff --git a/src/boost/libs/hana/test/optional/concat.cpp b/src/boost/libs/hana/test/optional/concat.cpp
new file mode 100644
index 000000000..40a2a0daf
--- /dev/null
+++ b/src/boost/libs/hana/test/optional/concat.cpp
@@ -0,0 +1,55 @@
+// 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/concat.hpp>
+#include <boost/hana/equal.hpp>
+#include <boost/hana/optional.hpp>
+
+#include <laws/base.hpp>
+namespace hana = boost::hana;
+using hana::test::ct_eq;
+
+
+int main() {
+    auto rv_nothing = [] { return hana::nothing; }; // rvalue nothing
+
+    BOOST_HANA_CONSTANT_CHECK(hana::equal(
+        hana::concat(rv_nothing(), hana::nothing),
+        hana::nothing
+    ));
+    BOOST_HANA_CONSTANT_CHECK(hana::equal(
+        hana::concat(hana::nothing, rv_nothing()),
+        hana::nothing
+    ));
+    BOOST_HANA_CONSTANT_CHECK(hana::equal(
+        hana::concat(rv_nothing(), rv_nothing()),
+        hana::nothing
+    ));
+    BOOST_HANA_CONSTANT_CHECK(hana::equal(
+        hana::concat(rv_nothing(), hana::just(ct_eq<0>{})),
+        hana::just(ct_eq<0>{})
+    ));
+    BOOST_HANA_CONSTANT_CHECK(hana::equal(
+        hana::concat(hana::just(ct_eq<0>{}), rv_nothing()),
+        hana::just(ct_eq<0>{})
+    ));
+
+    BOOST_HANA_CONSTANT_CHECK(hana::equal(
+        hana::concat(hana::nothing, hana::nothing),
+        hana::nothing
+    ));
+    BOOST_HANA_CONSTANT_CHECK(hana::equal(
+        hana::concat(hana::nothing, hana::just(ct_eq<0>{})),
+        hana::just(ct_eq<0>{})
+    ));
+    BOOST_HANA_CONSTANT_CHECK(hana::equal(
+        hana::concat(hana::just(ct_eq<0>{}), hana::nothing),
+        hana::just(ct_eq<0>{})
+    ));
+    BOOST_HANA_CONSTANT_CHECK(hana::equal(
+        hana::concat(hana::just(ct_eq<0>{}), hana::just(ct_eq<1>{})),
+        hana::just(ct_eq<0>{})
+    ));
+}