作法自毙

zuòfǎ-zìbì

[make a law only to fall foul of it oneself; be hoist with or by one's own petard; get caught in one's own trap] 立法者犯了自己所立的法而为其所害

怎奈此时官场中人, 十居其九是吃烟的, 哪一个肯建这个政策作法自毙呢?--《二十年目睹之怪现状》