/usr/share/doc/libghc-dual-tree-prof/changelog.Debian.gz is in libghc-dual-tree-prof 0.2.1-1build2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libghc-dual-tree-prof/../libghc-dual-tree-dev/changelog.Debian.gz