call site 10 for log.Producer.__call__
log/testing/test_log.py - line 27
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   def test_produce_one_keyword(self): 
       l = []
       py.log.setconsumer('s1', l.append) 
->     py.log.Producer('s1')("hello world") 
       assert len(l) == 1
       msg = l[0]
       assert msg.content().startswith('hello world') 
       assert msg.prefix() == '[s1] ' 
       assert str(msg) == "[s1] hello world"