anchor.diff:      hydra = callPackage ({ cl-lib ? null, elpaBuild, fetchurl, lib }:
         elpaBuild {
           pname = "hydra";
  +        ename = "hydra";
           version = "0.14.0";
           src = fetchurl {
             url = "https://elpa.gnu.org/packages/hydra-0.14.0.tar";
  
positive.code:     ack = callPackage ({ elpaBuild, fetchurl, lib }:
        elpaBuild {
          pname = "ack";
          version = "1.5";
          src = fetchurl {
            url = "https://elpa.gnu.org/packages/ack-1.5.tar";
  
negative.code:     pabbrev = callPackage ({ elpaBuild, fetchurl, lib }:
        elpaBuild {
          pname = "pabbrev";
          ename = "pabbrev";
          version = "4.2.1";
          src = fetchurl {
            url = "https://elpa.gnu.org/packages/pabbrev-4.2.1.el";
  