anchor.diff:      version = 2;
       owner = "pelletier";
       repo = "go-toml";
  -    rev = "e32a2e04744250647a72bf17da1b09befc03b6b1";
  -    sha256 = "024b68s48cfr0q0x1rprn7h6461z7a43q412qxqshdymyiik3j9c";
  +    rev = "fe206efb84b2bc8e8cfafe6b4c1826622be969e3";
  +    sha256 = "0jq9vg62knhqmkikmbcccjgrkj68fma80lm6dgn4mdambn255izk";
       propagatedBuildInputs = [
         go-buffruneio
       ];
       meta.useUnstable = true;
  -    date = "2017-03-29";
  +    date = "2017-04-05";
     };
   
     go-units = buildFromGitHub {
  
positive.code: 
    aws-sdk-go = buildFromGitHub {
      version = 2;
      rev = "v1.8.7";
      owner  = "aws";
      repo   = "aws-sdk-go";
      sha256 = "10hgsrsyhcf65bh36ng89jsv7wmynf11v1czwq5wdzx6yz54ysf9";
      excludedPackages = "\\(awstesting\\|example\\)";
      buildInputs = [
        tools
  
negative.code: 
    pkg = buildFromGitHub {
      version = 2;
      date = "2017-04-05";
      owner  = "coreos";
      repo   = "pkg";
      rev = "099530d80109cc4876ac866c38dded19786731d0";
      sha256 = "07qkjgpgpii98yw1i57p519xf8bbixrwzkh7q53dgzrn4ky76mf9";
      buildInputs = [
        crypto
        yaml_v1
  