/usr/lib/ghc-doc/hoogle/libghc-tasty-kat-doc.txt is in libghc-tasty-kat-doc 0.0.3-7build7.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-tasty-kat-doc/html/tasty-kat.txt