This commit was accidental. Reverting.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@131514 91177308-0d34-0410-b5e6-96231b3b80d8

test/thread/futures/futures.async/async.pass.cpp

@@ -164,7 +164,7 @@ int main()
         Clock::time_point t1 = Clock::now();
         assert(t1-t0 < ms(100));
     }
-/*
+
     {
         std::future<std::unique_ptr<int>> f =
                                std::async(f4, std::unique_ptr<int>(new int(3)));
@@ -174,4 +174,4 @@ int main()
         Clock::time_point t1 = Clock::now();
         assert(t1-t0 < ms(100));
     }
-*/}
+}