anchor.diff:        yaml_v2
       ];
       meta.useUnstable = true;
  -    date = "2017-12-31";
  +    date = "2018-01-24";
     };
   
     cockroach-go = buildFromGitHub {
  
positive.code:     version = 5;
      owner = "kr";
      repo = "pty";
      rev = "v1.1.0";
      sha256 = "1xx19sp6v4snnbks2gzrq5jpaqqsxq7p830jargl8mxji938wcym";
    };
  
    purell = buildFromGitHub {
  
negative.code: 
    go-lxc_v2 = buildFromGitHub {
      version = 5;
      rev = "b964baab402d04122567df45c56559f64512f143";
      owner  = "lxc";
      repo   = "go-lxc";
      sha256 = "16gk62nfxwf04lp8yaxcfzx420bidr1gk3idxzv7mzi6g5p82cj4";
      goPackagePath = "gopkg.in/lxc/go-lxc.v2";
      buildInputs = [
        pkgs.lxc
      ];
      date = "2018-01-19";
    };
  
    go-lz4 = buildFromGitHub {
  