anchor.diff:  
     distribution = buildFromGitHub {
       version = 2;
  -    rev = "0700fa570d7bcc1b3e46ee127c4489fd25f4daa3";
  +    rev = "a73ed75f5a33a1203450f1e86d396e7f1724d35c";
       owner = "docker";
       repo = "distribution";
  -    sha256 = "1hhxvfsln9aazxl5ll2qcd2r7jg5qia7mffi49mjcmmqah3bjf9j";
  +    sha256 = "1xciiv1hyawqm2ai1lw53p9ias46wj08ka877zvwpybrnqb385kr";
       propagatedBuildInputs = [
         cobra
         gorelic
  
positive.code: 
    gocql = buildFromGitHub {
      version = 2;
      rev = "f8b6dcaf4f8a770652c11e7e94b517fcb706fce8";
      owner  = "gocql";
      repo   = "gocql";
      sha256 = "1nkhf3q58y6hclf3vmd2wp0jbpdxj8vvlbkrkky3gdw5frs159vy";
      propagatedBuildInputs = [
        inf_v0
        snappy
        hailocab_go-hostpool
        net
      ];
      date = "2017-04-01";
    };
  
    gojsonpointer = buildFromGitHub {
  
negative.code:       find . -name \*_classic.go -delete
        rm internal/main.go
      '';
      date = "2017-04-10";
    };
  
    crypto = buildFromGitHub {
      version = 2;
      rev = "9ef620b9ca2f82b55030ffd4f41327fa9e77a92c";
      date = "2017-04-10";
      owner    = "golang";
      repo     = "crypto";
      sha256 = "0hl319ld0v5vw67v8n75d6fys5cxvnfjq3vjz6c4xxp16i5bwzx1";
      goPackagePath = "golang.org/x/crypto";
      goPackageAliases = [
        "code.google.com/p/go.crypto"
  