/usr/share/doc/libghc-stringbuilder-prof/changelog.Debian.gz is in libghc-stringbuilder-prof 0.4.0-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/doc/libghc-stringbuilder-prof/../libghc-stringbuilder-dev/changelog.Debian.gz