anchor.diff:        elpaBuild {
           pname = "rust-mode";
           ename = "rust-mode";
  -        version = "1.0.1";
  -        src = fetchurl {
  -          url = "https://elpa.nongnu.org/nongnu/rust-mode-1.0.1.tar";
  -          sha256 = "1rybjnaycvjgqp8g8lkjzgvnwd4565cbx88qlnxfrlqd5161r1k3";
  +        version = "1.0.2";
  +        src = fetchurl {
  +          url = "https://elpa.nongnu.org/nongnu/rust-mode-1.0.2.tar";
  +          sha256 = "08zkq5md20ppqlvd5xxsbzargs6ffzmjr1b1pq9i937l3n9d4swl";
           };
           packageRequires = [ emacs ];
           meta = {
  
positive.code:           license = lib.licenses.free;
          };
        }) {};
      swift-mode = callPackage ({ elpaBuild, emacs, fetchurl, lib, seq }:
        elpaBuild {
          pname = "swift-mode";
  
negative.code:       elpaBuild {
          pname = "geiser";
          ename = "geiser";
          version = "0.19";
          src = fetchurl {
            url = "https://elpa.nongnu.org/nongnu/geiser-0.19.tar";
            sha256 = "13w6gx6y8ilppcpfib5293600n0xy4xc4xa6idpmbcfd2pkmnw1x";
          };
          packageRequires = [ emacs ];
          meta = {
  