call site 0 for _thread.ThreadOut.write
thread/testing/test_io.py - line 23
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   def test_threadout_one(self):
       l = []
       self.out.setwritefunc(l.append)
->     print 42,13,
       x = l.pop(0)
       assert x == '42'
       x = l.pop(0)
       assert x == ' '
       x = l.pop(0)
       assert x == '13'