/usr/lib/ghc-doc/hoogle/libghc-expiring-cache-map-doc.txt is in libghc-expiring-cache-map-doc 0.0.6.1-3build3.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-expiring-cache-map-doc/html/expiring-cache-map.txt