/usr/share/doc/libghc-hashtables-prof/changelog.Debian.gz is in libghc-hashtables-prof 1.0.1.8-2build2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libghc-hashtables-prof/../libghc-hashtables-dev/changelog.Debian.gz