anchor.diff:  
     vim-ps1 = buildVimPluginFrom2Nix {
       pname = "vim-ps1";
  -    version = "2020-06-03";
  +    version = "2020-07-31";
       src = fetchFromGitHub {
         owner = "PProvost";
         repo = "vim-ps1";
  -      rev = "9d52746c3f879aa1aca4deb46edd63823d76d89d";
  -      sha256 = "1yx1rnpln0lxvf6pbdn8yyxiyhi7rfl8wl94kd8djk51h5lhq1n3";
  +      rev = "21d8d9a9db864f230a2d12d5076351daf20d7a44";
  +      sha256 = "0s6mi1mzlk40sfdqghdsv709fs89hf9d6iqaw3arzs9lmin2i4ka";
       };
       meta.homepage = "https://github.com/PProvost/vim-ps1/";
     };
  
positive.code: 
    calendar-vim = buildVimPluginFrom2Nix {
      pname = "calendar-vim";
      version = "2020-07-20";
      src = fetchFromGitHub {
        owner = "itchyny";
        repo = "calendar.vim";
        rev = "0f4a877a901cc04c226cdf1aad98948fb6ee47b8";
        sha256 = "06kjsmjk8vg7gamg1647injw7a5m12571hjwvvfsamjvdbfhr3nm";
      };
      meta.homepage = "https://github.com/itchyny/calendar.vim/";
    };
  
negative.code: 
    vim-plug = buildVimPluginFrom2Nix {
      pname = "vim-plug";
      version = "2020-08-02";
      src = fetchFromGitHub {
        owner = "junegunn";
        repo = "vim-plug";
        rev = "457bebcd30cbfca8b34b0d308f882b7b605714fc";
        sha256 = "18yj35qh3xqpjv1dd78m1wj7hkma3rv8qnfsnamhzafjwnf013sa";
      };
      meta.homepage = "https://github.com/junegunn/vim-plug/";
    };
  