As wmf deployed extension the ReadingLists extension should run phan on CI to found simple bugs in an earlier state of development.
The extension is using a trait for documentation of the database result wrapper, which makes phan very unhappy
See https://gerrit.wikimedia.org/r/#/c/mediawiki/extensions/ReadingLists/+/509533/ for a first removable, but a replacement was requested. I have no idea how or what to do.