call site 0 for path.local.make_numbered_dir
path/local/testing/test_local.py - line 253
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   def test_make_numbered_dir(self):
       root = self.tmpdir
       root.ensure('base.not_an_int', dir=1)
       for i in range(10):
           numdir = local.make_numbered_dir(prefix='base.', rootdir=root,
->                                          keep=2, lock_timeout=0)
           assert numdir.check()
           assert numdir.basename == 'base.%d' %i
           if i>=1:
               assert numdir.new(ext=str(i-1)).check()
           if i>=2:
               assert numdir.new(ext=str(i-2)).check()
           if i>=3:
               assert not numdir.new(ext=str(i-3)).check()