call site 5 for log.Producer.__call__
log/testing/test_log.py - line 38
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   def test_producer_class(self): 
       p = py.log.Producer('x1') 
       l = []
       py.log.setconsumer(p.keywords, l.append) 
->     p("hello") 
       assert len(l) == 1
       assert len(l[0].keywords) == 1
       assert 'x1' == l[0].keywords[0]