/usr/lib/ghc-doc/hoogle/split.txt is in libghc-split-doc 0.2.2-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-split-doc/html/split.txt
/usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-split-doc/html/split.txt