/usr/lib/ghc-doc/hoogle/tasty-hunit.txt is in libghc-tasty-hunit-doc 0.4.1-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-tasty-hunit-doc/html/tasty-hunit.txt