anchor.diff:        elpaBuild {
           pname = "corfu";
           ename = "corfu";
  -        version = "0.27";
  -        src = fetchurl {
  -          url = "https://elpa.gnu.org/packages/corfu-0.27.tar";
  -          sha256 = "1i8nl94aaa5p4bp0idsmph3z61lccg9a7plbsnpicy0klsaj69r2";
  +        version = "0.28";
  +        src = fetchurl {
  +          url = "https://elpa.gnu.org/packages/corfu-0.28.tar";
  +          sha256 = "0gayzzxac42nxj1612isc4f5xishrr0bnvycpcfmkm5pf41kq50f";
           };
           packageRequires = [ emacs ];
           meta = {
  
positive.code:           license = lib.licenses.free;
          };
        }) {};
      undo-tree = callPackage ({ elpaBuild, emacs, fetchurl, lib, queue }:
        elpaBuild {
          pname = "undo-tree";
  
negative.code:       elpaBuild {
          pname = "vertico";
          ename = "vertico";
          version = "0.28";
          src = fetchurl {
            url = "https://elpa.gnu.org/packages/vertico-0.28.tar";
            sha256 = "0rkvfya674hy8g37hy40knwwppbygmx005cg04136kdlkmywb0l1";
          };
          packageRequires = [ emacs ];
          meta = {
  