/usr/lib/ghc-doc/hoogle/hoopl.txt is in ghc-doc 8.0.2-11.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/ghc-doc/html/libraries/hoopl-3.10.2.1/hoopl.txt
/usr/lib/ghc-doc/hoogle/../../../share/doc/ghc-doc/html/libraries/hoopl-3.10.2.1/hoopl.txt