anchor.diff:      async = callPackage ({ elpaBuild, fetchurl, lib }:
         elpaBuild {
           pname = "async";
  +        ename = "async";
           version = "1.9.2";
           src = fetchurl {
             url = "https://elpa.gnu.org/packages/async-1.9.2.tar";
  
positive.code:     multishell = callPackage ({ cl-lib ? null, elpaBuild, fetchurl, lib }:
        elpaBuild {
          pname = "multishell";
          version = "1.1.5";
          src = fetchurl {
            url = "https://elpa.gnu.org/packages/multishell-1.1.5.tar";
  
negative.code:     wcheck-mode = callPackage ({ elpaBuild, fetchurl, lib }:
        elpaBuild {
          pname = "wcheck-mode";
          ename = "wcheck-mode";
          version = "2016.1.30";
          src = fetchurl {
            url = "https://elpa.gnu.org/packages/wcheck-mode-2016.1.30.el";
  