MarsSeed [1] filed a deletion request for lua51-pam [2]: Discontinued PAM module for Lua from 2015 [a]. VCS package in disguise. Broken for 16+ months due to GitHub git URL protocol deprecation.
Only two discontinued and likely defunct modules depend on it, which I've also submitted for deletion: PRQ#45675, PRQ#45676. [a]: https://github.com/devurandom/lua-pam [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/lua51-pam/
