anchor.diff:  
     kubernetes-api = buildFromGitHub {
       version = 3;
  -    rev = "kubernetes-1.8.2";
  +    rev = "218912509d74a117d05a718bb926d0948e531c20";
       owner  = "kubernetes";
       repo   = "api";
  -    sha256 = "1m3fjz98a580v92ks2ggvbkl09yz7iid7ryspc8pb9w7qqs0s12l";
  +    sha256 = "1wcnm61kqclpg940jbkyfl5yf6aha9887kk8agc9fv28b2v74pw8";
       goPackagePath = "k8s.io/api";
       goPackageAliases = [
         "k8s.io/client-go/pkg/apis"
  
positive.code: 
    ini = buildFromGitHub {
      version = 3;
      rev = "v1.30.3";
      owner  = "go-ini";
      repo   = "ini";
      sha256 = "0xjw8nnpikvpj6z3ar7mc6rz5cwydm5qkw54lfgdi4li6vazy9lp";
    };
  
    ini_v1 = buildFromGitHub {
      version = 3;
      rev = "v1.30.3";
      owner  = "go-ini";
      repo   = "ini";
      goPackagePath = "gopkg.in/ini.v1";
      sha256 = "0r92as0ir1mj8wrc995kqnxjp0bx10m1hclj13r6c8r4p1zr27nw";
    };
  
    inject = buildFromGitHub {
  
negative.code: 
    mysql = buildFromGitHub {
      version = 3;
      rev = "404c02a8a39c65a587e5ceedbd6e29c2ca185aca";
      owner  = "go-sql-driver";
      repo   = "mysql";
      sha256 = "0l8262cj30bk393k9brk4mr9df8z2hmmqh1xnv59rg1mrn53qyl0";
      postPatch = ''
        grep -r '+build appengine' -l | xargs rm
      '';
      date = "2017-11-14";
    };
  
    net-rpc-msgpackrpc = buildFromGitHub {
  