anchor.diff:  
     docker = buildFromGitHub {
       version = 2;
  -    rev = "5add856be6411f776556f85b9e3ef17049de043e";
  +    rev = "2cf32ee04360add15b4431ba55032824ac089349";
       owner = "docker";
       repo = "docker";
  -    sha256 = "1rd4dp6lwjiwbsbpqbg8fiaswdhag752h3v08manxhzivnh5kxx2";
  +    sha256 = "1rl77qxvnvkvg0ajv6swx02602pf6gwqdppkp1i9ka9ba3lfzj4a";
       meta.useUnstable = true;
  -    date = "2016-12-19";
  +    date = "2016-12-20";
     };
   
     docker_for_runc = buildFromGitHub {
  
positive.code:     repo   = "go-version";
      sha256 = "13jrvfmg7vx1zzsjbwyfaxh06y8si7f9drcpy0400pv9fv9fxfs7";
      date = "2016-10-31";
    };
  
    go-zookeeper = buildFromGitHub {
  
negative.code: 
    consul = buildFromGitHub rec {
      version = 2;
      rev = "v0.7.2";
      owner = "hashicorp";
      repo = "consul";
      sha256 = "0sxbxplg0g9adfgxl893s8x32rdzg6xy855fgmgj00n8rjzr3vdq";
  
      buildInputs = [
        datadog-go circbuf armon_go-metrics go-radix speakeasy bolt
  