Revert Add <optional>. Will recommit with better commit message

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@283978 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/utilities/optional/optional.object/optional.object.observe/op_arrow.pass.cpp

@@ -1,72 +0,0 @@
-//===----------------------------------------------------------------------===//
-//
-//                     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
-}