anchor.diff:        elpaBuild {
           pname = "wisitoken-grammar-mode";
           ename = "wisitoken-grammar-mode";
  -        version = "1.0.3";
  -        src = fetchurl {
  -          url = "https://elpa.gnu.org/packages/wisitoken-grammar-mode-1.0.3.tar";
  -          sha256 = "1vljnhi35vix30xch9mziczg56ss1r615yn2pgdcw8wa8sm14crw";
  +        version = "1.1.0";
  +        src = fetchurl {
  +          url = "https://elpa.gnu.org/packages/wisitoken-grammar-mode-1.1.0.tar";
  +          sha256 = "123z9j76cm0p22d9n4kqvn2477fdkgp5jarw564nd71cxrrb52ms";
           };
           packageRequires = [ emacs mmm-mode wisi ];
           meta = {
  
positive.code:         packageRequires = [ cl-print emacs stream ];
          meta = {
            homepage = "https://elpa.gnu.org/packages/el-search.html";
            license = lib.licenses.free;
          };
        }) {};
  
negative.code:         packageRequires = [ emacs ];
          meta = {
            homepage = "https://elpa.gnu.org/packages/xr.html";
            license = lib.licenses.free;
          };
        }) {};
      xref = callPackage ({ elpaBuild, emacs, fetchurl, lib, project }:
        elpaBuild {
          pname = "xref";
          ename = "xref";
          version = "1.0.1";
          src = fetchurl {
            url = "https://elpa.gnu.org/packages/xref-1.0.1.el";
            sha256 = "17wlwilm2d1gvin8mkkqnpw2skjx0klxfs1pqpy8rrzdfpsb55li";
          };
          packageRequires = [ emacs project ];
          meta = {
            homepage = "https://elpa.gnu.org/packages/xref.html";
            license = lib.licenses.free;
          };
        }) {};
  