/usr/lib/ghc-doc/hoogle/polyparse.txt is in libghc-polyparse-doc 1.9-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-polyparse-doc/html/polyparse.txt
/usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-polyparse-doc/html/polyparse.txt