anchor.diff:  
     crypto = buildFromGitHub {
       version = 3;
  -    rev = "7e9105388ebff089b3f99f0ef676ea55a6da3a7e";
  -    date = "2017-05-23";
  +    rev = "e1a4589e7d3ea14a3352255d04b6f1a418845e5e";
  +    date = "2017-06-01";
       owner    = "golang";
       repo     = "crypto";
  -    sha256 = "1m4j17lqi4898bipw9s8kvacc46cr4gkh6lvl9d18k2whq09m7fg";
  +    sha256 = "17bmnj04hpb53yi3m5j2y6j7sb30123miz3q601qdzvv0b2rnkca";
       goPackagePath = "golang.org/x/crypto";
       buildInputs = [
         net_crypto_lib
  
positive.code:     version = 3;
      owner = "pelletier";
      repo = "go-toml";
      rev = "26ae43fdeeea7db6778850f76cc828b232da1e13";
      sha256 = "05vs0ysm096n29rm6jjjpjb81ch5dkh5zrwwz0y2r71qb6vhl655";
      propagatedBuildInputs = [
        go-buffruneio
      ];
      meta.useUnstable = true;
      date = "2017-05-30";
    };
  
    go-units = buildFromGitHub {
  
negative.code:     version = 3;
      owner = "spf13";
      repo = "cobra";
      rev = "8d4ce3549a0bf0e3569df3aae7423b7743cd05a9";
      date = "2017-05-31";
      sha256 = "07adgsmrbwybm7j372hlbdm1m5caqmvi9yi04w0q8yc2ncgign2m";
      buildInputs = [
        go-homedir
        mousetrap
  