Fix cancelled type handling

tests/test_cancellation.py

@@ -331,9 +331,9 @@ async def test_nested_multierrors(loglevel, start_method):
 
                     # windows is often too slow and cancellation seems
                     # to happen before an actor is spawned
-                    if subexc is trio.Cancelled:
+                    if isinstance(subexc, trio.Cancelled):
                         continue
-
+                    else:
                         # on windows it seems we can't exactly be sure wtf
                         # will happen..
                         assert subexc.type in (