1 files changed, 34 insertions, 0 deletions
diff --git a/src/boost/libs/hana/test/optional/unpack.cpp b/src/boost/libs/hana/test/optional/unpack.cpp
new file mode 100644
index 000000000..5968d33a3
--- /dev/null
+++ b/src/boost/libs/hana/test/optional/unpack.cpp
@@ -0,0 +1,34 @@
+// 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/unpack.hpp>
+
+#include <laws/base.hpp>
+namespace hana = boost::hana;
+
+
+int main() {
+    hana::test::ct_eq<2> x{};
+    hana::test::_injection<0> f{};
+
+    BOOST_HANA_CONSTANT_CHECK(hana::equal(
+        hana::unpack(hana::nothing, f),
+        f()
+    ));
+
+    BOOST_HANA_CONSTANT_CHECK(hana::equal(
+        hana::unpack(hana::just(x), f),
+        f(x)
+    ));
+
+    // Previously, there was a bug that would make this fail.
+    auto non_const_nothing = hana::nothing;
+    BOOST_HANA_CONSTANT_CHECK(hana::equal(
+        hana::unpack(non_const_nothing, f),
+        f()
+    ));
+}