/usr/lib/ghc-doc/hoogle/vty.txt is in libghc-vty-doc 4.7.0.20-3build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-vty-doc/html/vty.txt
/usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-vty-doc/html/vty.txt