vendor/libc++/libc++-trunk-r290819

1 files changed, 33 insertions, 0 deletions

diff --git a/test/std/utilities/optional/optional.object/optional.object.observe/value_const.fail.cpp b/test/std/utilities/optional/optional.object/optional.object.observe/value_const.fail.cpp
new file mode 100644
index 000000000000..6076c509fa41
--- /dev/null
+++ b/test/std/utilities/optional/optional.object/optional.object.observe/value_const.fail.cpp
@@ -0,0 +1,33 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++98, c++03, c++11, c++14
+// <optional>
+
+// constexpr const T& optional<T>::value() const &;
+
+#include <optional>
+#include <type_traits>
+#include <cassert>
+
+using std::optional;
+
+struct X
+{
+    constexpr int test() const {return 3;}
+    int test() {return 4;}
+};
+
+int main()
+{
+    {
+        constexpr optional<X> opt;
+        static_assert(opt.value().test() == 3, "");
+    }
+}