call site 6 for log.get
log/testing/test_logger.py - line 19
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   def test_log_preset():
       log = py.log.get(test_log_preset) 
       l2 = []
       log.set_sub(x1=None, x2=l2.append)
       l3 = []
       log2 = py.log.get(test_log_preset, 
                         x2=None,
->                       x3=l3.append)
   
       log2.x2("hello")
       log2.x3("world")
       assert l2[0].strcontent() == "hello"
       assert l3[0].strcontent() == "world"