anchor.diff:  
     govalidator = buildFromGitHub {
       version = 3;
  -    rev = "133eba7d8257761201f2d4d8dcbf774692fdb946";
  +    rev = "38ddb4612a5dfc2878731749ee825853d9f0aaa1";
       owner = "asaskevich";
       repo = "govalidator";
  -    sha256 = "07xf3sls29w7imq9g1r9khjy3lgx294bgjbnwg73pbajwfs9aczq";
  -    date = "2017-04-29";
  +    sha256 = "1n0hf9yyqpc5bdjj5pjm18g3mmhvf31ri1wfjrd84752qv1ddz3d";
  +    date = "2017-05-07";
     };
   
     go-autorest = buildFromGitHub {
  
positive.code: 
    google-cloud-go = buildFromGitHub {
      version = 3;
      date = "2017-05-02";
      rev = "085c05ca074a8de9107005f9baa6308eae7eaf41";
      owner = "GoogleCloudPlatform";
      repo = "google-cloud-go";
      sha256 = "1vk7f81x3hgf0p58n7kqnqxv1bwh0yzxjnvvya9bx38hl7ifxypg";
      goPackagePath = "cloud.google.com/go";
      goPackageAliases = [
        "google.golang.org/cloud"
  
negative.code:     version = 3;
      owner = "spf13";
      repo = "pflag";
      rev = "80fe0fb4eba54167e2ccae1c6c950e72abf61b73";
      date = "2017-05-05";
      sha256 = "05v96r3dandnzgw6s0i3zamfb820sxxwn7qy2jlsznl838ivcsgg";
    };
  
    pkcs7 = buildFromGitHub {
  