anchor.diff:  
     programs.neovim = {
       enable = true;
  -    package = pkgs.neovim;
  +    package = pkgs.neovim-nightly;
       withNodeJs = true;
  -    withPython = true;
  -    extraPythonPackages = (ps: with ps; []);
       withPython3 = true;
       extraPython3Packages = (ps: with ps; [ ]);
       plugins = with pkgs.vimPlugins; [
  
positive.code:       set updatetime=300
  
        " python host progs
        let g:python_host_prog="~/.nix-profile/bin/nvim-python"
        let g:python3_host_prog="~/.nix-profile/bin/nvim-python3"
        "}}}
  
  
negative.code: { config, pkgs, ... }:
  {
    nixpkgs.overlays = [
      (import (builtins.fetchTarball {
        url = https://github.com/nix-community/neovim-nightly-overlay/archive/master.tar.gz;
      }))
    ];
  
    home.packages = with pkgs; [
  