anchor.diff:      version = 2;
       owner = "pkg";
       repo = "sftp";
  -    rev = "1189af57876f9ce079097fe9f33a7cd9488df41d";
  -    date = "2017-02-28";
  -    sha256 = "0r9zv8mlamxzm09rd6n6802ynj1794csdlrn5fjryskcifhwggq7";
  +    rev = "1077779d4478e66c237c7be3a98ea98ff76f99ce";
  +    date = "2017-03-02";
  +    sha256 = "0dgf94av2vbpk0alcnd89hk6y4v8ydv6li7npmx2y2qplqgl2r30";
       propagatedBuildInputs = [
         crypto
         errors
  
positive.code: 
    circonus-gometrics = buildFromGitHub {
      version = 2;
      date = "2017-02-21";
      rev = "dbab9a33438e3f8317407ef5d3a51c29340541db";
      owner  = "circonus-labs";
      repo   = "circonus-gometrics";
      sha256 = "19gc4p5n47axnypxss70as03fbvb0mb06zii5xiq3s6sv5hf6lf7";
      propagatedBuildInputs = [
        circonusllhist
        go-retryablehttp
  
negative.code: 
    tools = buildFromGitHub {
      version = 2;
      rev = "8ffd8eda92fbb57a42688bcd05e2481b813f88e8";
      date = "2017-03-04";
      owner = "golang";
      repo = "tools";
      sha256 = "1zdmrqvpr8q67z7i0yp7vz4pa4y228cz5k3p70q2bw6hrpgj3s90";
      goPackagePath = "golang.org/x/tools";
      goPackageAliases = [ "code.google.com/p/go.tools" ];
  
  