anchor.diff:        ''
           let &rtp.=(empty(&rtp)?"":',')."${vimPlugins.pathogen.rtp}"
           execute pathogen#infect('${pluginsEnv}/{}')
  +
  +        filetype indent plugin on | syn on
         '');
   
         /* vim-plug is an extremely popular vim plugin manager.
  
positive.code:         set packpath-=~/.vim/after
          set packpath+=${packDir packages}
          set packpath+=~/.vim/after
        '');
  
    in writeText "vimrc" ''
    " minimal setup, generated by NIX
    set nocompatible
  
    ${vamImpl}
    ${pathogenImpl}
    ${plugImpl}
    ${nativeImpl}
  
    filetype indent plugin on | syn on
  
    ${customRC}
    '';
  
negative.code: 
        in assert builtins.hasAttr "vim-addon-manager" knownPlugins;
        ''
          filetype indent plugin on | syn on
  
          let g:nix_plugin_locations = {}
          ${lib.concatMapStrings (plugin: ''
            let g:nix_plugin_locations['${plugin.pname}'] = "${plugin.rtp}"
  