/usr/lib/ghc-doc/hoogle/heist.txt is in libghc-heist-doc 0.13.0.2-1build4.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-heist-doc/html/heist.txt
/usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-heist-doc/html/heist.txt