HatsuSixty [1] filed a deletion request for solar2d [2]: As the AUR user FabioLolix pointed out in a comment, this is a disguised -bin pkgbuild, and I have already re-uploaded this package as solar2d-bin, therefore I think this package should be deleted as a duplicate of solar2d-bin.
[1] https://aur.archlinux.org/account/HatsuSixty/ [2] https://aur.archlinux.org/pkgbase/solar2d/