anchor.diff:  
     aws-sdk-go = buildFromGitHub {
       version = 2;
  -    rev = "v1.6.20";
  +    rev = "v1.6.21";
       owner  = "aws";
       repo   = "aws-sdk-go";
  -    sha256 = "0w1i6cqlp778g8xwixlm5g907nz7z8f4ifsmv85kjcr0ni638yyw";
  +    sha256 = "1970khywnvb7amla9chmqn4h03ddjlifjkjsxag68jdgpbk4r5nk";
       excludedPackages = "\\(awstesting\\|example\\)";
       buildInputs = [
         tools
  
positive.code:   };
  
    go-cleanhttp = buildFromGitHub {
      version = 1;
      date = "2016-04-07";
      rev = "ad28ea4487f05916463e2423a55166280e8254b5";
      owner = "hashicorp";
      repo = "go-cleanhttp";
      sha256 = "1knpnv6wg2fnnsk2h2bj4m003f7xsvwm58vnn9gc753mbr78vx00";
    };
  
    go-collectd = buildFromGitHub {
  
negative.code:     version = 2;
      owner = "rfjakob";
      repo = "eme";
      rev = "fd00240838d2e0fe6b2c58bf5b27db843d828ad5";
      date = "2017-02-05";
      sha256 = "1zykkxsc6606iwrsnvr7kvz8f44snspm35ym2d0cyx45kvbd5195";
      meta.useUnstable = true;
    };
  
  