anchor.diff:        elpaBuild {
           pname = "rust-mode";
           ename = "rust-mode";
  -        version = "0.5.0";
  -        src = fetchurl {
  -          url = "https://elpa.nongnu.org/nongnu/rust-mode-0.5.0.tar";
  -          sha256 = "03z1nsq1s3awaczirlxixq4gwhz9bf1x5zwd5xfb88ay4kzcmjwc";
  +        version = "1.0.0";
  +        src = fetchurl {
  +          url = "https://elpa.nongnu.org/nongnu/rust-mode-1.0.0.tar";
  +          sha256 = "0ch3hf954iy5hh5zyjjg68szdk5icppmi8nbap27wfwgvhvyfa67";
           };
           packageRequires = [ emacs ];
           meta = {
  
positive.code:           license = lib.licenses.free;
          };
        }) {};
      arduino-mode = callPackage ({ elpaBuild, emacs, fetchurl, lib, spinner }:
        elpaBuild {
          pname = "arduino-mode";
  
negative.code:         packageRequires = [];
          meta = {
            homepage = "https://elpa.gnu.org/packages/guru-mode.html";
            license = lib.licenses.free;
          };
        }) {};
      haml-mode = callPackage ({ cl-lib ? null, elpaBuild, emacs, fetchurl, lib }:
        elpaBuild {
          pname = "haml-mode";
          ename = "haml-mode";
          version = "3.1.10";
          src = fetchurl {
            url = "https://elpa.nongnu.org/nongnu/haml-mode-3.1.10.tar";
            sha256 = "1qkhm52xr8vh9zp728ass5kxjw7fj65j84m06db084qpavnwvysa";
          };
          packageRequires = [ cl-lib emacs ];
          meta = {
            homepage = "https://elpa.gnu.org/packages/haml-mode.html";
            license = lib.licenses.free;
          };
        }) {};
  