Revert "[coroutines] Add std::experimental::task<T> type"

This revision is causing build and test failures, such as
http://lab.llvm.org:8011/builders/libcxx-libcxxabi-libunwind-armv8-linux/builds/648/steps/test.libcxx/logs/stdio,
so I'll revert it.

llvm-svn: 357023

1 files changed, 0 insertions, 70 deletions

diff --git a/libcxx/test/std/experimental/task/task.basic/task_of_value.pass.cpp b/libcxx/test/std/experimental/task/task.basic/task_of_value.pass.cpp
deleted file mode 100644
index 0d5a8c9f619..00000000000
--- a/libcxx/test/std/experimental/task/task.basic/task_of_value.pass.cpp
+++ /dev/null
@@ -1,70 +0,0 @@
-// -*- C++ -*-
-//===----------------------------------------------------------------------===//
-//
-//                     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
-
-#include <experimental/task>
-#include <string>
-#include <vector>
-#include <memory>
-#include "../sync_wait.hpp"
-
-void test_returning_move_only_type()
-{
-  auto move_only_async =
-   [](bool x) -> std::experimental::task<std::unique_ptr<int>> {
-     if (x) {
-       auto p = std::make_unique<int>(123);
-       co_return p; // Should be implicit std::move(p) here.
-     }
-
-     co_return std::make_unique<int>(456);
-   };
-
-  assert(*sync_wait(move_only_async(true)) == 123);
-  assert(*sync_wait(move_only_async(false)) == 456);
-}
-
-void test_co_return_with_curly_braces()
-{
-  auto t = []() -> std::experimental::task<std::tuple<int, std::string>>
-  {
-    co_return { 123, "test" };
-  }();
-
-  auto result = sync_wait(std::move(t));
-
-  assert(std::get<0>(result) == 123);
-  assert(std::get<1>(result) == "test");
-}
-
-void test_co_return_by_initialiser_list()
-{
-  auto t = []() -> std::experimental::task<std::vector<int>>
-  {
-    co_return { 2, 10, -1 };
-  }();
-
-  auto result = sync_wait(std::move(t));
-
-  assert(result.size() == 3);
-  assert(result[0] == 2);
-  assert(result[1] == 10);
-  assert(result[2] == -1);
-}
-
-int main()
-{
-  test_returning_move_only_type();
-  test_co_return_with_curly_braces();
-  test_co_return_by_initialiser_list();
-
-  return 0;
-}