a821 [1] filed a deletion request for haskell-ide-engine [2]: Orphan. Upstream repo has been archived on Oct 2020. This is superseded by `haskell-language-server` available in [extra].
[1] https://aur.archlinux.org/account/a821/ [2] https://aur.archlinux.org/pkgbase/haskell-ide-engine/
