anchor.diff:      version = "0.10";
       src = fetchurl {
         url = "mirror://cpan/authors/id/J/JH/JHOBLITT/Pod-Tidy-0.10.tar.gz";
  -      sha256 = "1gcxjplgksnc5iggi8dzbkbkcryii5wjhypd7fs3kmbwx91y2vl8";
  +      hash = "sha256-iG7hQ+p81Tm0O+16KHmJ0Wc211y/ofheLMzq+eiVnb0=";
       };
       propagatedBuildInputs = [ EncodeNewlines IOString PodWrap TextGlob ];
       buildInputs = [ TestCmd ];
  
positive.code:     version = "0.13";
      src = fetchurl {
        url = "mirror://cpan/authors/id/H/HA/HAARG/MRO-Compat-0.13.tar.gz";
        sha256 = "1y547lr6zccf7919vx01v22zsajy528psanhg5aqschrrin3nb4a";
      };
      meta = {
        description = "Mro::* interface compatibility for Perls < 5.9.5";
  
negative.code:     version = "0.06";
      src = fetchurl {
        url = "mirror://cpan/authors/id/F/FL/FLORA/Shell-Command-0.06.tar.gz";
        hash = "sha256-8+Te71d5RL5G+nr1rBGKwoKJEXiLAbx2p0SVNVYW7NE=";
      };
      meta = {
        description = "Cross-platform functions emulating common shell commands";
  