call site 1 for code.Source.__init__
apigen/source/testing/test_html.py - line 164
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   def test_get_encoding_ascii():
       temp = py.test.ensuretemp('test_get_encoding')
       fpath = temp.join('ascii.py')
       fpath.write(str(py.code.Source("""\
           def foo():
               return 'foo'
->     """)))
       # XXX I think the specs say we have to assume latin-1 here...
       assert get_module_encoding(fpath.strpath) == 'ISO-8859-1'