anchor.diff:      owner = "pkg";
       repo = "sftp";
       rev = "1.0.0";
  -    sha256 = "0bb1v0kv414bxlanp2kzsifydi90ab0lscrd8651psvsqagjkafj";
  +    sha256 = "6db3e8721d5062e30bca1ddabd6f7aa4d30a44562d9f2428cff6d7a6a6c7a6d0";
       propagatedBuildInputs = [
         crypto
         errors
  
positive.code: 
    build = buildFromGitHub {
      version = 3;
      rev = "8c6825293e8a53095b592dbe19dd2031d1af826a";
      date = "2017-08-18";
      owner = "golang";
      repo = "build";
      sha256 = "11zpc2inxh45f4zh0zpnvpbp7qramb65wdrrjvan3ybf5ymkcwvy";
      goPackagePath = "golang.org/x/build";
      subPackages = [
        "autocertcache"
  
negative.code: 
    dbus = buildFromGitHub {
      version = 3;
      rev = "97646858c46433e4afb3432ad28c12e968efa298";
      owner = "godbus";
      repo = "dbus";
      sha256 = "17849dfzyqz1b6f6ysz5wc3n8mb32jgaannc47jancif3z0gq5x1";
      date = "2017-08-22";
    };
  
    decimal = buildFromGitHub {
  