asyncio, Tulip issue 171: BaseEventLoop.close() now raises an exception if the

event loop is running. You must first stop the event loop and then wait until
it stopped, before closing it.

Lib/test/test_asyncio/test_events.py

@@ -1365,6 +1365,15 @@ class EventLoopTestsMixin:
         with self.assertRaises(RuntimeError):
             loop.add_writer(w, callback)
 
+    def test_close_running_event_loop(self):
+        @asyncio.coroutine
+        def close_loop(loop):
+            self.loop.close()
+
+        coro = close_loop(self.loop)
+        with self.assertRaises(RuntimeError):
+            self.loop.run_until_complete(coro)
+
 
 class SubprocessTestsMixin: