/usr/lib/ghc-doc/hoogle/pipes-safe.txt is in libghc-pipes-safe-doc 2.0.2-1build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-pipes-safe-doc/html/pipes-safe.txt