asyncio: sync with Tulip, add a new asyncio.coroutines module
diff --git a/Lib/asyncio/test_utils.py b/Lib/asyncio/test_utils.py
index d9c7ae2..94054e7 100644
--- a/Lib/asyncio/test_utils.py
+++ b/Lib/asyncio/test_utils.py
@@ -27,6 +27,7 @@
 from . import futures
 from . import selectors
 from . import tasks
+from .coroutines import coroutine
 
 
 if sys.platform == 'win32':  # pragma: no cover
@@ -43,7 +44,7 @@
 
 
 def run_briefly(loop):
-    @tasks.coroutine
+    @coroutine
     def once():
         pass
     gen = once()