call site 13 for log.default.set_consumer
log/testing/test_log.py - line 80
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   def test_simple_consumer_match_2(self): 
       l = []
       p = py.log.Producer("x1 x2")
->     p.set_consumer(l.append) 
       p("42")
       assert l
       assert l[0].content() == "42"