/usr/lib/ghc-doc/hoogle/libghc-dependent-map-doc.txt is in libghc-dependent-map-doc 0.2.4.0-1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-dependent-map-doc/html/dependent-map.txt