anchor.diff:  
     aniseed = buildVimPluginFrom2Nix {
       pname = "aniseed";
  -    version = "2021-01-08";
  +    version = "2020-12-21";
       src = fetchFromGitHub {
         owner = "Olical";
         repo = "aniseed";
  
positive.code: 
    vimspector = buildVimPluginFrom2Nix {
      pname = "vimspector";
      version = "2021-01-07";
      src = fetchFromGitHub {
        owner = "puremourning";
        repo = "vimspector";
        rev = "07ea3880acf5977075831c64536e683ddb2fed89";
        sha256 = "1gkvagird3xa47gicpc739s4c5p5358yvp16fxx2l98jzzi7wvcj";
        fetchSubmodules = true;
      };
      meta.homepage = "https://github.com/puremourning/vimspector/";
  
negative.code: 
    nvim-treesitter = buildVimPluginFrom2Nix {
      pname = "nvim-treesitter";
      version = "2021-01-08";
      src = fetchFromGitHub {
        owner = "nvim-treesitter";
        repo = "nvim-treesitter";
        rev = "00ea65199e316aec5934cc2666ec9738e410b711";
        sha256 = "1q37hd8cggx863d91ld9r4s51wld73pqgq93zwlg22i7qyl2v423";
      };
      meta.homepage = "https://github.com/nvim-treesitter/nvim-treesitter/";
    };
  