anchor.diff:        vimrcConfig.vam.knownPlugins = vimPlugins;
         vimrcConfig.vam.pluginDictionaries = [
             # the plugin list form ~/.vim-scripts turned into nix format added to
  -          # the buffer created by the nix#ExportPluginsForNix 
  +          # the buffer created by the nix#ExportPluginsForNix
         ];
       }
   
  
positive.code: 
  nix#ExportPluginsForNix is provided by ./vim2nix
  
  A buffer will open containing the plugin derivation lines as well list 
  fitting the vimrcConfig.vam.pluginDictionaries option.
  
  Thus the most simple usage would be:
  
negative.code:   in writeText "vimrc" ''
    " minimal setup, generated by NIX
    set nocompatible
  
    ${vamImpl}
    ${pathogenImpl}
    ${vundleImpl}
    ${neobundleImpl}
  
    filetype indent plugin on | syn on
  
    ${customRC}
    '';
  