anchor.diff:  
     yaml_v2 = buildFromGitHub {
       version = 2;
  -    rev = "14227de293ca979cf205cd88769fe71ed96a97e2";
  -    date = "2017-01-24";
  +    rev = "4c78c975fe7c825c6d1466c42be594d1d6f3aba6";
  +    date = "2017-01-25";
       owner = "go-yaml";
       repo = "yaml";
  -    sha256 = "04av1h9ikvis0f929725laikj183sry6vk6dndgj15i1ljzcydj1";
  +    sha256 = "05aqavjysh55xqif67m331lz7h1d7zjqxjqy1jkncdn313if2548";
       goPackagePath = "gopkg.in/yaml.v2";
     };
   
  
positive.code: 
    circonus-gometrics = buildFromGitHub {
      version = 2;
      date = "2017-01-23";
      rev = "25af98e31e307ad1371f6f1e37eb4ef97e3c1b0d";
      owner  = "circonus-labs";
      repo   = "circonus-gometrics";
      sha256 = "1knafp5l934b6q9sm5d6llf46kv9wdgk467717wfll819bibl8sj";
      propagatedBuildInputs = [
        circonusllhist
        go-retryablehttp
  
negative.code: 
    grpc-gateway = buildFromGitHub {
      version = 2;
      rev = "cfee3c5f91d8b8b54b216781e246443bb73b1a8e";
      owner = "grpc-ecosystem";
      repo = "grpc-gateway";
      sha256 = "14r01l134kngcimlgw7jfr94d2ix313h7sbf4pd1vrlsng6sjv2p";
      propagatedBuildInputs = [
        glog
        grpc
        net
        protobuf
      ];
      date = "2017-01-25";
    };
  
  
  