Hi Yutaka, one of the bugs of treil was a candidate for the Bug of the Day[1] today. As far as I can see on popcon[2] for the library package the usage vote is close to zero.
Thus I would suggest to remove this package from unstable. What do you think? Kind regards Andreas. [1] https://salsa.debian.org/tille/tiny_qa_tools/-/wikis/Tiny-QA-tasks [2] https://qa.debian.org/popcon-graph.php?packages=libtreil0&show_installed=on&show_vote=on&want_legend=on&want_ticks=on&from_date=&to_date=&hlght_date=&date_fmt=%25Y-%25m&beenhere=1 -- https://fam-tille.de