docs: def _expect_token(self, expected):
          """ Compares the next token in the stream to the specified token.
  
              `expected`
                  Expected token string to match.
  
              * Raises a ``ParseError`` exception if token doesn't match
                `expected`.
              """
  
          item = self._lexer.get_token()
  
          if not item:
              raise ParseError(u'Unexpected end of file')
  
          else:
              line_no, token = item
  
          if token != expected:
              raise ParseError(u"Unexpected token '{0}', "
                               u"expecting '{1}' on line {2}"
                               .format(common.from_utf8(token.strip()), expected,
                                       line_no))