MarsSeed [1] filed a deletion request for vala0.44 [2]: No other AUR package requires this legacy version, and it conflicts with repo's newer vala package. I recommend deletion, and it's safe to do so at this point.
[1] https://aur.archlinux.org/account/MarsSeed/ [2] https://aur.archlinux.org/pkgbase/vala0.44/
