'Report error details.'

def error(self):

    (type, value, module, line, function) = _exception_data()
    print >>sys.stderr, ('%s:    %s' % (type, value))
    print >>sys.stderr, ('input    line    %s' % self.abs_line_number())
    print >>sys.stderr, ('module    %s,    line    %s,    function    %s' % (module, line, function))
