anchor.diff:  
     go-couchbase = buildFromGitHub {
       version = 3;
  -    rev = "bb5ab95856cdeb773a5393ea869bcc71d39201e0";
  +    rev = "6defcd092f488018f2bbda66750ae720d2b97c82";
       owner  = "couchbase";
       repo   = "go-couchbase";
  -    sha256 = "1xaph189573xgmm7v8nrzhn3vwyiy9a43i54y5ishgygnbhdkci3";
  -    date = "2017-05-26";
  +    sha256 = "0j122qblllxfwjp2w5f700n6x8qx05xgrr2fi70kwamm8i4xvzww";
  +    date = "2017-06-02";
       goPackageAliases = [
         "github.com/couchbaselabs/go-couchbase"
       ];
  
positive.code: 
    go-ethereum = buildFromGitHub {
      version = 3;
      date = "2017-05-30";
      rev = "41bdf49eedf003a051446ec3831a4c04178ac040";
      owner  = "ethereum";
      repo   = "go-ethereum";
      sha256 = "11bq7qfab3dx88i3xipdjpj7qw85fnghh3sxvrilcfyqh3kqc117";
      subPackages = [
        "crypto/sha3"
      ];
  
negative.code: 
    crypto = buildFromGitHub {
      version = 3;
      rev = "e1a4589e7d3ea14a3352255d04b6f1a418845e5e";
      date = "2017-06-01";
      owner    = "golang";
      repo     = "crypto";
      sha256 = "17bmnj04hpb53yi3m5j2y6j7sb30123miz3q601qdzvv0b2rnkca";
      goPackagePath = "golang.org/x/crypto";
      buildInputs = [
        net_crypto_lib
  