/usr/lib/ghc-doc/hoogle/derive.txt is in libghc-derive-doc 2.5.13-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-derive-doc/html/derive.txt
/usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-derive-doc/html/derive.txt