def _verify_assumptions(self):
text = self.annotation<EOL>keys = text.keys()<EOL>if '<STR_LIT>' not in text or text['<STR_LIT>'] != '<STR_LIT:L>':<EOL><INDENT>raise ParserFeatureNotImplementedError(u'<STR_LIT>')<EOL><DEDENT>if '<STR_LIT>' in keys:<EOL><INDENT>raise ParserFeatureNotImplementedError(u'<STR_LIT>')<EOL><DEDENT>if text['<STR_LIT>'] not in ['<STR_LIT>', '<STR_LIT>', '<STR_LIT>', '<STR_LIT>']:<EOL><INDENT>raise ParserFeatureNotImplementedError(u'<STR_LIT>'<EOL>u'<STR_LIT>'.format(text['<STR_LIT>']))<EOL><DEDENT>
Verify that all assumptions made by the parser hold.