Okay, I'm finally giving #Neovim a try; I've been using #Vim for months now and hadn't even tried Neovim, so now I'm doing it.
And to be sure I give it a fair try…
~] vim
The program 'vim' is not in your PATH. It is provided by several packages.
You can make it available in an ephemeral shell by typing one of the following:
nix-shell -p vim
nix-shell -p vimHugeX
nix-shell -p vimPlugins.vim-elixir
nix-shell -p vimPlugins.vimacs