fix an encoding issue in gevent.core for PY3 #38

gevent/core.ppyx

@@ -354,6 +354,8 @@ cdef public class loop [object PyGeventLoopObject, type PyGeventLoop_Type]:
             return libev.EV_MINPRI
 
     def _handle_syserr(self, message, errno):
+        if sys.version_info[0] >= 3:
+            message = message.decode()
         self.handle_error(None, SystemError, SystemError(message + ': ' + os.strerror(errno)), None)
 
     cpdef handle_error(self, context, type, value, tb):

known_failures.py

@@ -94,7 +94,6 @@ if PY3:
     # No idea / TODO
     FAILING_TESTS += '''
 test__example_udp_server.py
-test_close_backend_fd.py
 test__examples.py
 test__pool.py
 FLAKY test___example_servers.py