anchor.diff:  
     hcl = buildFromGitHub {
       version = 2;
  -    date = "2016-10-08";
  -    rev = "6f5bfed9a0a22222fbe4e731ae3481730ba41e93";
  +    date = "2016-10-19";
  +    rev = "99ce73d4fe576449f7a689d4fc2b2ad09a86bdaa";
       owner  = "hashicorp";
       repo   = "hcl";
  -    sha256 = "0bwqhac2wi9217bxd640xd1k88i74za34kv2b579hvphja13n98q";
  +    sha256 = "0nhps3aa89sn8sh1a7jld8zfwrxsg92iqmfkqppjkw0ky86d6vag";
     };
   
     hdrhistogram = buildFromGitHub {
  
positive.code: 
    go-systemd = buildFromGitHub {
      version = 2;
      rev = "2c9a2f6e703caf3523f0e5783af22855c3159413";
      owner = "coreos";
      repo = "go-systemd";
      sha256 = "0612y5pz1m2gij5krfda5g30g3s3dhrl6siqi4kw3677128qdi8a";
      propagatedBuildInputs = [
        dbus
        pkg
        pkgs.systemd_lib
      ];
      date = "2016-10-17";
    };
  
    go-systemd_journal = buildFromGitHub {
  
negative.code: 
    mapstructure = buildFromGitHub {
      version = 2;
      date = "2016-10-20";
      rev = "f3009df150dadf309fdee4a54ed65c124afad715";
      owner  = "mitchellh";
      repo   = "mapstructure";
      sha256 = "1bcyq49psjkmln9g6qh1rvfg69qdf0s3nqa6jrrcqw70f669j8g1";
    };
  
    match = buildFromGitHub {
  