anchor.diff:  
     circonus-gometrics = buildFromGitHub {
       version = 2;
  -    date = "2016-09-14";
  -    rev = "02e91ce11e80e4ee29de4fec93250f04ba47f222";
  +    date = "2016-11-01";
  +    rev = "f8e2e2ff37c349aed537b70c9430ded0ea473248";
       owner  = "circonus-labs";
       repo   = "circonus-gometrics";
  -    sha256 = "1hjcs8lgq4xz53c1i2m367kcifq0m021k1cdq1drpazsba2nd3w9";
  +    sha256 = "0rbbzzg6znjm7pc7shi5fy92dp649348fi88h2570815al6jhqrn";
       propagatedBuildInputs = [
         circonusllhist
         go-retryablehttp
  
positive.code: 
    gcloud-golang = buildFromGitHub {
      version = 2;
      date = "2016-10-28";
      rev = "28994ff9b5baa92fe337dacaee126fcf80fefa3e";
      owner = "GoogleCloudPlatform";
      repo = "gcloud-golang";
      sha256 = "0k9i47sk45dfxnx5zzjsjqdb3zlbifs9xrdpf5ij8mkhwqp4qjjs";
      goPackagePath = "cloud.google.com/go";
      goPackageAliases = [
        "google.golang.org/cloud"
  
negative.code: 
    aws-sdk-go = buildFromGitHub {
      version = 2;
      rev = "v1.5.0";
      owner  = "aws";
      repo   = "aws-sdk-go";
      sha256 = "0d8qgwvyq0ifly80fdg6sv0dfsgi4wiagknwprscwccrjpjhnxjk";
      excludedPackages = "\\(awstesting\\|example\\)";
      buildInputs = [
        tools
  