anchor.diff:  
     syncthing = buildFromGitHub rec {
       version = 2;
  -    rev = "v0.14.17";
  +    rev = "v0.14.18";
       owner = "syncthing";
       repo = "syncthing";
  -    sha256 = "0knj5y5shgc211j3k75qyay59l5vy72zblwd0x0vy5plq1n1vnm0";
  +    sha256 = "1z5kisrr2zyqdm1ar6lmr8wcmk5z63apyplj9z0yg7fjhc60rmnk";
       buildFlags = [ "-tags noupgrade" ];
       buildInputs = [
         go-lz4 du luhn xdr snappy ratelimit osext
  
positive.code: 
    docker = buildFromGitHub {
      version = 2;
      rev = "5374d53322abd6a5b2ebb34b7422abc26d1b5eb3";
      owner = "docker";
      repo = "docker";
      sha256 = "1m4vpkj4gjin7xh5msg2byp12ypxp7qawa96m666ca9r9a60vlyr";
      meta.useUnstable = true;
      date = "2016-12-30";
    };
  
    docker_for_runc = buildFromGitHub {
  
negative.code: 
    ipfs = buildFromGitHub {
      version = 2;
      date = "2017-01-01";
      rev = "defd1a17e5c524cd82e30e87d768beeeffff587b";
      owner = "ipfs";
      repo = "go-ipfs";
      sha256 = "0m5g689aif2qygzvrvi92bfm50jsccc4x5ncvf3m4xjy74921vr2";
      gxSha256 = "0difcnsbp9fvzy6x9a962zal8xsy3mks9z78lq9swpa6bvpfx096";
      subPackages = [
        "cmd/ipfs"
        "cmd/ipfswatch"
  