call site 2 for log.default.__init__
log/testing/test_log.py - line 72
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   def test_simple_consumer_match(self): 
       l = []
       py.log.setconsumer("x1", l.append)
->     p = py.log.Producer("x1 x2")
       p("hello")
       assert l
       assert l[0].content() == "hello"