anchor.diff:      version = 3;
       owner = "btcsuite";
       repo = "btcd";
  -    date = "2017-05-18";
  -    rev = "45967f8641ce9c692b8aff6c9127523c908f8894";
  -    sha256 = "0dy3izbwgqqyx9rdp10s28lxriwq19bj9rjp69zdsm6qzpa42zq0";
  +    date = "2017-05-21";
  +    rev = "f8673776ab781c033b57ac2147fc4a9e6837ccd2";
  +    sha256 = "1c4qd5npyqmci1h77pbl92z94cfpcafgixiiv12lnpc0ywfmriha";
       subPackages = [
         "btcec"
       ];
  
positive.code: 
    go-winio = buildFromGitHub {
      version = 3;
      rev = "v0.4.1";
      owner  = "Microsoft";
      repo   = "go-winio";
      sha256 = "1rn838d6a9jsik4692iq311l0vaxmfnagglsmxq6zqlyl85yhzi8";
      buildInputs = [
        sys
      ];
  
negative.code:     version = 3;
      owner = "spf13";
      repo = "jWalterWeatherman";
      rev = "0efa5202c04663c757d84f90f5219c1250baf94f";
      date = "2017-05-23";
      sha256 = "09m0y94jvwv45j5iajs10c6z85kr366zcgn10rnyb4dgn3ahyx51";
      goPackageAliases = [
        "github.com/spf13/jwalterweatherman"
      ];
  