anchor.diff:  
     ### The following derivations are generated by nix#ExportPluginsForNix
   
  -
     "Colour_Sampler_Pack" = buildVimPluginFrom2Nix { # created by nix#NixDerivation
       name = "Colour_Sampler_Pack";
       src = fetchurl {
  
positive.code: 
    };
    "sensible" = buildVimPluginFrom2Nix { # created by nix#NixDerivation
      name = "sensible-2014-11-24";
      src = fetchgit {
        url = "git://github.com/tpope/vim-sensible";
        rev = "b30dcf387af977acfa21732592bfca05598b2188";
        sha256 = "6a9fc68c3eb0ee500ac59bdbc2c48d98e88a2936ee544f7203fa1a0296002b5f";
      };
      dependencies = [];
  
    };
    "snipmate" = buildVimPluginFrom2Nix { # created by nix#NixDerivation
      name = "snipmate-2015-03-21";
      src = fetchgit {
        url = "git://github.com/garbas/vim-snipmate";
        rev = "2079ea5aadaada568f78acfc6b565945625ed97d";
        sha256 = "47f5d131485f8a57389a0b455c6e83f8f543d71a04cbaa7af594b3abe9099d9f";
      };
      dependencies = ["vim-addon-mw-utils" "tlib"];
  
  
negative.code: rec {
  
    ### section I: manually mantained plugins
    airline = vim-airline;
    alternative = a; # backwards compat, added 2014-10-21
    command_T = command-t; # backwards compat, added 2014-10-18
    gitgutter = vim-gitgutter;
    haskellConceal = haskellconceal; # backwards compat, added 2014-10-18
    necoGhc = neco-ghc; # backwards compat, added 2014-10-18
    nerdcommenter = The_NERD_Commenter;
    stylishHaskell = stylish-haskell; # backwards compat, added 2014-10-18
    tmuxNavigator = tmux-navigator; # backwards compat, added 2014-10-18
    youcompleteme = YouCompleteMe;
  
    a = buildVimPlugin {
      name = "a-git-2010-11-06";
  