a821 [1] filed a deletion request for haskell-ide-engine-git [2]: Orphan and broken for two years. The upstream repo has been archived on Oct 2020 and it's succeeded by `haskell-language-server` (available in [extra] while the git version in AUR).
[1] https://aur.archlinux.org/account/a821/ [2] https://aur.archlinux.org/pkgbase/haskell-ide-engine-git/
