/usr/lib/ghc-doc/hoogle/libghc-hashable-doc.txt is in libghc-hashable-doc 1.2.6.1-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-hashable-doc/html/hashable.txt