utils/style_doc.py/DocstringStyler/is_special_block
class DocstringStyler:    def is_special_block(self, line):
        if self.is_no_style_block(line):
            if self.previous_indent is None and self.in_block == SpecialBlock.ARG_LIST:
                self.previous_indent = self.current_indent
            self.in_block = SpecialBlock.NO_STYLE
            return True
        if _re_arg_def.search(line) is not None:
            self.in_block = SpecialBlock.ARG_LIST
            return True
        return False