call site 16 for path.local.chdir
test/testing/test_config.py - line 28
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   def test_config_cmdline_options(): 
       o = py.test.ensuretemp('configoptions') 
       o.ensure("conftest.py").write(py.code.Source(""" 
           import py
           def _callback(option, opt_str, value, parser, *args, **kwargs):
               option.tdest = True
           Option = py.test.config.Option
           option = py.test.config.addoptions("testing group", 
               Option('-G', '--glong', action="store", default=42,
                      type="int", dest="gdest", help="g value."), 
               # XXX note: special case, option without a destination
               Option('-T', '--tlong', action="callback", callback=_callback,
                       help='t value'),
               )
           """))
->     old = o.chdir() 
       try: 
           config = py.test.config._reparse(['-G', '17'])
       finally: 
           old.chdir() 
       assert config.option.gdest == 17