MarsSeed [1] filed a deletion request for ns3-hg [2]: Legacy VCS package, not needed. Source code migrated to GitLab git in 2018.
Safe to delete, nothing depends on it, and it is long broken anyway. [1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/ns3-hg/
