/usr/lib/ghc-doc/hoogle/pastis.txt is in libghc-pastis-doc 0.1.2-5build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-pastis-doc/html/pastis.txt
/usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-pastis-doc/html/pastis.txt