Rhinoceros [1] filed a request to merge r-vimcom [2] into nvim-r [3]:

Upstream has discontinued vim-r, and replaced it with nvim-r [3]. r-vimcom was previously required for vim-r, but has now been included in nvim-r.

[3] http://www.vim.org/scripts/script.php?script_id=2628

[1] https://aur.archlinux.org/account/Rhinoceros/ [2] https://aur.archlinux.org/pkgbase/r-vimcom/ [3] https://aur.archlinux.org/pkgbase/nvim-r/