/usr/lib/ghc-doc/hoogle/libghc-haxr-doc.txt is in libghc-haxr-doc 3000.11.2-3build8.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/ghc-doc/hoogle/../../../share/doc/libghc-haxr-doc/html/haxr.txt