--- tornado/test/asyncio_test.py.orig   2018-01-04 21:07:44 +0000
+++ tornado/test/asyncio_test.py        2020-02-26 01:21:49 +0000
@@ -46,7 +46,7 @@
         if hasattr(asyncio, 'ensure_future'):
             ensure_future = asyncio.ensure_future
         else:
-            ensure_future = asyncio.async
+            ensure_future = getattr(asyncio, 'async')

         x = yield ensure_future(
             asyncio.get_event_loop().run_in_executor(None, lambda: 42))