Remove cleanup workaround to fix some ResourceWarnings

diff --git a/tornado/test/asyncio_test.py b/tornado/test/asyncio_test.py
index 0b18ee5f961d4a269d4822e1ad211b904da9e903..3d6bb39cc090515acb780b9c1ddb4b735c662a91 100644 (file)
--- a/tornado/test/asyncio_test.py
+++ b/tornado/test/asyncio_test.py
@@ -108,9 +108,6 @@ class AsyncIOLoopTest(AsyncTestCase):
             self.asyncio_loop.run_until_complete(native_coroutine_with_adapter2()),
             42,
         )
-        # I'm not entirely sure why this manual cleanup is necessary but without
-        # it we have at-a-distance failures in ioloop_test.TestIOLoopCurrent.
-        asyncio.set_event_loop(None)
 
 
 class LeakTest(unittest.TestCase):