anchor.diff:    };
   
     swift = buildFromGitHub {
  -    version = 2;
  -    rev = "8e9b10220613abdbc2896808ee6b43e411a4fa6c";
  +    version = 3;
  +    rev = "bf51ccd3b5c3a1f12ac762b4511c5f9f1ce6b26f";
       owner  = "ncw";
       repo   = "swift";
  -    sha256 = "0rp54ghj07dvb6501kvhijq8cnl72k6m99baxqk7jjda8fd2kk0r";
  -    date = "2017-03-15";
  +    sha256 = "0jrxn0jnihlxsqphkbz02w6d7386na8f6dhraak8dskb9pj4grzx";
  +    date = "2017-05-16";
     };
   
     anacrolix_sync = buildFromGitHub {
  
positive.code:     version = 3;
      owner = "minio";
      repo = "minio-go";
      rev = "5d7ee332f62e83d36beba669be671801180abb89";
      sha256 = "02lwdnxr4xpc37d7b841hd68zd2kzh9isglk8h0z80l2f13z1411";
      meta.useUnstable = true;
      date = "2017-05-12";
    };
  
    missinggo = buildFromGitHub {
  
negative.code: 
    aws-sdk-go = buildFromGitHub {
      version = 3;
      rev = "v1.8.23";
      owner  = "aws";
      repo   = "aws-sdk-go";
      sha256 = "01yf4lviyhl7ijwsbmr969i43iwkbaji6382h2x4nvxjzqqcn5f3";
      excludedPackages = "\\(awstesting\\|example\\)";
      buildInputs = [
        tools
  