def _check_rst_data(self, data):
        """Returns warnings when the provided data doesn't compile."""
        # the include and csv_table directives need this to be a path
        source_path = self.distribution.script_name or 'setup.py'
        parser = docutils.parsers.rst.Parser()
        settings = docutils.frontend.OptionParser(
            components=(docutils.parsers.rst.Parser,)
        ).get_default_values()
        settings.tab_width = 4
        settings.pep_references = None
        settings.rfc_references = None
        reporter = SilentReporter(
            source_path,
            settings.report_level,
            settings.halt_level,
            stream=settings.warning_stream,
            debug=settings.debug,
            encoding=settings.error_encoding,
            error_handler=settings.error_encoding_error_handler,
        )

        document = docutils.nodes.document(settings, reporter, source=source_path)
        document.note_source(source_path, -1)
        try:
            parser.parse(data, document)
        except AttributeError as e:
            reporter.messages.append(
                (-1, 'Could not finish the parsing: %s.' % e, '', {})
            )

        return reporter.messages
Returns warnings when the provided data doesn't compile.
product/gradle-plugin/src/main/python/setuptools/_distutils/command/check.py