anchor.diff:    };
   
     tomb = buildFromGitHub {
  +    date = "2014-06-26";
       rev = "14b3d72120e8d10ea6e6b7f87f7175734b1faab8";
       owner = "go-tomb";
       repo = "tomb";
  
positive.code:   };
  
    spacelog = buildFromGitHub {
      rev = "ae95ccc1eb0c8ce2496c43177430efd61930f7e4";
      owner = "spacemonkeygo";
      repo = "spacelog";
  
negative.code:   };
  
    flagfile = buildFromGitHub {
      date   = "2015-02-13";
      rev    = "871ce569c29360f95d7596f90aa54d5ecef75738";
      owner  = "spacemonkeygo";
      repo   = "flagfile";
  