1 files changed, 72 insertions, 0 deletions
diff --git a/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/op_arrow.pass.cpp b/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/op_arrow.pass.cpp
new file mode 100644
index 00000000000..2f1648c48c8
--- /dev/null
+++ b/libcxx/test/std/utilities/optional/optional.object/optional.object.observe/op_arrow.pass.cpp
@@ -0,0 +1,72 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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 T* optional<T>::operator->();
+
+#ifdef _LIBCPP_DEBUG
+#define _LIBCPP_ASSERT(x, m) ((x) ? (void)0 : std::exit(0))
+#endif
+
+#include <optional>
+#include <type_traits>
+#include <cassert>
+
+#include "test_macros.h"
+
+using std::optional;
+
+struct X
+{
+    int test() noexcept {return 3;}
+};
+
+struct Y
+{
+    constexpr int test() {return 3;}
+};
+
+constexpr int
+test()
+{
+    optional<Y> opt{Y{}};
+    return opt->test();
+}
+
+int main()
+{
+    {
+        std::optional<X> opt; ((void)opt);
+        ASSERT_SAME_TYPE(decltype(opt.operator->()), X*);
+        // ASSERT_NOT_NOEXCEPT(opt.operator->());
+        // FIXME: This assertion fails with GCC because it can see that
+        // (A) operator->() is constexpr, and
+        // (B) there is no path through the function that throws.
+        // It's arguable if this is the correct behavior for the noexcept
+        // operator.
+        // Regardless this function should still be noexcept(false) because
+        // it has a narrow contract.
+    }
+    {
+        optional<X> opt(X{});
+        assert(opt->test() == 3);
+    }
+    {
+        static_assert(test() == 3, "");
+    }
+#ifdef _LIBCPP_DEBUG
+    {
+        optional<X> opt;
+        assert(opt->test() == 3);
+        assert(false);
+    }
+#endif  // _LIBCPP_DEBUG
+}