anchor.diff:  
     mongo-tools = buildFromGitHub {
       version = 3;
  -    rev = "641dda4beef2fa437b04077c881bb3d48633add9";
  +    rev = "9252f90b49617b63a37c38610a9f9084c8e84478";
       owner  = "mongodb";
       repo   = "mongo-tools";
  -    sha256 = "1ihvms84ijb9fr9rc659f40nk2ka5b0n5k3f8rgy3a4jp9wbfkg8";
  +    sha256 = "1b14r6dnrl17hy27w4mhadkzband45xkrn8b4v58j1b25b0kyjzj";
       buildInputs = [
         crypto
         escaper
  
positive.code:       seed
      ];
      meta.useUnstable = true;
      date = "2017-08-15";
    };
  
    memcache = buildFromGitHub {
  
negative.code:     version = 3;
      owner = "shurcooL";
      repo = "sanitized_anchor_name";
      rev = "86672fcb3f950f35f2e675df2240550f2a50762f";
      date = "2017-09-18";
      sha256 = "1wz3vr7cm291bmrc7xd6v6vb5fk66iqjkky34snfkv5k1bvqlkqv";
    };
  
    sarama_v1 = buildFromGitHub {
  