因为 xz 的事去看了 m4 的手册 ……每个自动化软件都应该贴一段这样的防沉迷警告
Once really addicted, users devot[e] more time debugging their m4 scripts than doing real work. Beware that m4 may be dangerous for the health of compulsive programmers.
Please be advised that this post was written or last updated a while ago and may therefore contain outdated information or opinions I no longer hold.
请知悉本文自写作或上次更新已届相当时限，或包含过时信息及观点。