/usr/lib/ghc-doc/hoogle/HsSyck.txt is in libghc-hssyck-doc 0.50-5build1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-hssyck-doc/html/HsSyck.txt
/usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-hssyck-doc/html/HsSyck.txt