anchor.diff:  
     go-shellwords = buildFromGitHub {
       version = 2;
  -    rev = "525bedee691b5a8df547cb5cf9f86b7fb1883e24";
  +    rev = "33bd8f1ebe16d6e5eb688cc885749a63059e9167";
       owner  = "mattn";
       repo   = "go-shellwords";
  -    sha256 = "0ch7f3128mac8ymfh15p2nrsis5472h9yr6dzwmmc6dbcslpvfk1";
  -    date = "2016-03-15";
  +    sha256 = "0q4r0bc0wmxkgn1cpfcaai0527mfnxpqcsccj96bkifsi0hn9cyy";
  +    date = "2017-01-21";
     };
   
     go-simplejson = buildFromGitHub {
  
positive.code: 
    gomemcached = buildFromGitHub {
      version = 2;
      rev = "832858c5df7b06c4d1df2b0d98e0a4213416a500";
      date = "2016-12-01";
      owner = "couchbase";
      repo = "gomemcached";
      sha256 = "010qdrrrzyj74jj21riamq1p1s8cra58syy8vjy66jl8mi18b4w7";
      propagatedBuildInputs = [
        goutils_logging
      ];
  
negative.code: 
    go-dockerclient = buildFromGitHub {
      version = 2;
      date = "2017-01-20";
      rev = "53f04ab33b89eef256c320c36435a10b672d473d";
      owner = "fsouza";
      repo = "go-dockerclient";
      sha256 = "1da80a4h7wl9s4byr51nbls8b51xkm72dhvm2fgfldiv0bazygqp";
      propagatedBuildInputs = [
        docker_for_go-dockerclient
        go-cleanhttp
  