anchor.diff:    };
   
     columnize = buildFromGitHub {
  -    rev = "v2.1.0";
  +    rev = "0.0.0";
       owner  = "ryanuber";
       repo   = "columnize";
       sha256 = "116rpzavh1qls2mcwvyiayzlr29ilrx4y2xk1qyky9x1d30qm8xg";
     };
   
     command = buildFromGitHub {
  -    rev = "0.0.1";
  +    rev = "0.0.0";
       owner  = "odeke-em";
       repo   = "command";
       sha256 = "1ghckzr8h99ckagpmb15p61xazdjmf9mjmlym634hsr9vcj84v62";
  
positive.code:   };
  
    gojsonreference = buildFromGitHub {
      rev = "e02fc20de94c78484cd5ffb007f8af96be030a45";
      owner  = "xeipuuv";
      repo   = "gojsonreference";
      sha256 = "1v845pwpwa5ivx602x73csavbkgqj4ar1v1yymfyai1cjmi1r58h";
  
negative.code: 
    mdns = buildFromGitHub {
      date = "2015-12-05";
      rev = "0.0.0";
      owner = "hashicorp";
      repo = "mdns";
      sha256 = "03j2xbi9n1gzbv5pdlw7p9xb31mds8d95rg186xmv755c2lsjjb0";
  