anchor.diff:    ListBinarySearch = buildPerlPackage {
       pname = "List-BinarySearch";
       version = "0.25";
  -    src = pkgs.fetchurl {
  +    src = fetchurl {
         url = "mirror://cpan/authors/id/D/DA/DAVIDO/List-BinarySearch-0.25.tar.gz";
         sha256 = "0ap8y9rsjxg75887klgij90mf459f8dwy0dbx1g06h30pmqk04f8";
       };
  
positive.code:   SysVirt = buildPerlModule rec {
      pname = "Sys-Virt";
      version = "6.3.0";
      src = assert version == pkgs.libvirt.version; pkgs.fetchgit {
        url = "git://libvirt.org/libvirt-perl.git";
        rev = "v${version}";
        sha256 = "0m75g0kf2dmllx5c1wxzszm1zakiqjighcsjbgq66674pvqf5mk7";
  
negative.code: 
  { config
  , stdenv, buildPackages, pkgs
  , fetchurl, fetchgit, fetchpatch, fetchFromGitHub
  , perl, overrides, buildPerl, shortenPerlShebang
  }:
  
  