call site 2 for log.Producer.__call__
log/testing/test_log.py - line 58
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   def test_log_none(self): 
       log = py.log.Producer("XXX")
       l = []
       py.log.setconsumer('XXX', l.append)
->     log("1")
       assert l 
       l[:] = []
       py.log.setconsumer('XXX', None) 
       log("2")
       assert not l