vendor/libc++/libc++-trunk-r321017

1 files changed, 38 insertions, 0 deletions

diff --git a/test/std/thread/futures/futures.async/async.fail.cpp b/test/std/thread/futures/futures.async/async.fail.cpp
new file mode 100644
index 000000000000..594c67f52699
--- /dev/null
+++ b/test/std/thread/futures/futures.async/async.fail.cpp
@@ -0,0 +1,38 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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: libcpp-has-no-threads
+// UNSUPPORTED: c++98, c++03, c++11, c++14, c++17
+// UNSUPPORTED: clang-3.3, clang-3.4, clang-3.5, clang-3.6, clang-3.7, clang-3.8
+
+// <future>
+
+// template <class F, class... Args>
+//     future<typename result_of<F(Args...)>::type>
+//     async(F&& f, Args&&... args);
+
+// template <class F, class... Args>
+//     future<typename result_of<F(Args...)>::type>
+//     async(launch policy, F&& f, Args&&... args);
+
+
+#include <future>
+#include <atomic>
+#include <memory>
+#include <cassert>
+
+#include "test_macros.h"
+
+int foo (int x) { return x; }
+
+int main ()
+{
+	std::async(                    foo, 3); // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+	std::async(std::launch::async, foo, 3); // expected-error {{ignoring return value of function declared with 'nodiscard' attribute}}
+}
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