/usr/lib/ghc-doc/hoogle/representable-tries.txt is in libghc-representable-tries-doc 3.0.2-2build2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-representable-tries-doc/html/representable-tries.txt