Method negative_lookahead

Tools/peg_generator/pegen/parser.py:286–290

(self, func: Callable[..., object], *args: object)

        return ok

    def negative_lookahead(self, func: Callable[..., object], *args: object) -> bool:
        mark = self._mark()
        ok = func(*args)
        self._reset(mark)
        return not ok

    def make_syntax_error(self, message: str, filename: str = "<unknown>") -> SyntaxError:
        tok = self._tokenizer.diagnose()