anchor.diff:          };
         }) {};
       mentor = callPackage ({ async
  -                          , cl-lib ? null
                             , elpaBuild
                             , emacs
                             , fetchurl
  
positive.code:       elpaBuild {
          pname = "mentor";
          ename = "mentor";
          version = "0.3.5";
          src = fetchurl {
            url = "https://elpa.nongnu.org/nongnu/mentor-0.3.5.tar";
            sha256 = "01zrvfk2njzyzjzkvp5hv5cjl1k1qjrila1ab4bv26gf6bkq5xh3";
          };
          packageRequires = [ async cl-lib emacs seq xml-rpc ];
          meta = {
            homepage = "https://elpa.gnu.org/packages/mentor.html";
            license = lib.licenses.free;
  
negative.code:       elpaBuild {
          pname = "boxquote";
          ename = "boxquote";
          version = "2.3";
          src = fetchurl {
            url = "https://elpa.nongnu.org/nongnu/boxquote-2.3.tar";
            sha256 = "1d072qls4ywl71wi29khlq4w6yw9idp55vf811nvbmiihn6lwmiv";
          };
          packageRequires = [ cl-lib ];
          meta = {
  