e, Object info)</tt>
</dt><dd>This method should be called whenever a non-recoverable error occurs.  It 
    responds by calling <tt>report_error()</tt>, then aborts parsing
    by calling the parser method <tt>done_parsing()</tt>, and finally
    throws an exception.  (In general <tt>done_parsing()</tt> should be called 
    at any point that parsing needs to be terminated early).
</dd><dt><tt>public List<Integer> expected_token_ids()</tt>
</dt><dd>This method informs during parsing and especially when han