[test] Cleanup nullopt_t tests

* Update specification text from N4387

* Delete not_brace_initializable.fail.cpp: it's redundant with nullopt_t.fail.cpp

* is_empty<T> implies is_class<T>

* is_literal is deprecated; directly verify that we can create a nullopt_t in a constexpr context

Differential Revision: D37024

llvm-svn: 312256

1 files changed, 0 insertions, 25 deletions

diff --git a/libcxx/test/std/utilities/optional/optional.nullopt/not_brace_initializable.fail.cpp b/libcxx/test/std/utilities/optional/optional.nullopt/not_brace_initializable.fail.cpp
deleted file mode 100644
index 86da5054a70..00000000000
--- a/libcxx/test/std/utilities/optional/optional.nullopt/not_brace_initializable.fail.cpp
+++ /dev/null
@@ -1,25 +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>
-
-// struct nullopt_t{see below};
-
-#include <optional>
-
-using std::optional;
-using std::nullopt_t;
-
-int main()
-{
-    // I roughly interpret LWG2736 as "it shall not be possible to copy-list-initialize nullopt_t with an
-    // empty braced-init-list."
-    nullopt_t foo = {};
-}