anchor.diff:  
     prometheus_common = buildFromGitHub {
       version = 3;
  -    date = "2017-06-16";
  -    rev = "0d0c3d572886e0f2323ed376557f9eb99b97d25b";
  +    date = "2017-06-21";
  +    rev = "0866df4b85a18d652b6965be022d007cdf076822";
       owner = "prometheus";
       repo = "common";
  -    sha256 = "13pb5y04d684xqgix90yqa17j6dcsfy8ark1rw68yl773gqxxwzg";
  +    sha256 = "1m3psca61rjwa0rxnvnbkwjbx54bzkfm8zyzbns5796ygyrvrqdf";
       buildInputs = [
         net
         prometheus_client_model
  
positive.code: 
    hugo = buildFromGitHub {
      version = 3;
      owner = "spf13";
      repo = "hugo";
      rev = "v0.23";
      sha256 = "1sfy7fpbsp3z21qgx03898505s6g6klml2yl99hn292xfiknzj52";
      buildInputs = [
        ace
        afero
  
negative.code:     version = 3;
      owner = "minio";
      repo = "minio-go";
      rev = "2cca719d0760cc8906b0843a3e1e93fe9dbd8bb4";
      sha256 = "0alhl6kpyf3fqcqahc1c2bjvvrrgz5lgvdz1sfhbbl4pnyg7b70a";
      meta.useUnstable = true;
      date = "2017-06-23";
    };
  
    missinggo = buildFromGitHub {
  