anchor.diff:        yaml_v2
       ];
       meta.useUnstable = true;
  -    date = "2017-12-01";
  +    date = "2017-12-06";
       postPatch = ''
         rm cmd/gateway-{azure,s3}*.go
         sed -i 's,return newAzureLayer.*,break,' cmd/gateway-main.go
  
positive.code:     sha256 = "0qsrllh5w8qxslvwgb8pd9n35jv2p2wscnsqjbqwn77b2lnw78i4";
      buildInputs = [
        errors
        kit
        kingpin_v2
        net
        prometheus_client_model
  
negative.code:     owner = "go-kit";
      repo = "kit";
      sha256 = "1v28lsb4n921zylska4ca8cz11sgs2jzcgcyr8ciap5mv5i1xj01";
      subPackages = [
        "log"
        "log/level"
        "metrics"
        "metrics/expvar"
        "metrics/generic"
        "metrics/influx"
        "metrics/internal/lv"
        "metrics/prometheus"
      ];
      propagatedBuildInputs = [
        gohistogram
        influxdb_client
        logfmt
        prometheus_client_golang
        stack
      ];
    };
  
    kit_for_prometheus = kit.override {
      subPackages = [
        "log"
        "log/level"
  