/usr/lib/ghc-doc/hoogle/event-list.txt is in libghc-event-list-doc 0.1.0.2-3build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-event-list-doc/html/event-list.txt