anchor.diff:  
     sys = buildFromGitHub {
       version = 2;
  -    rev = "9bb9f0998d48b31547d975974935ae9b48c7a03c";
  -    date = "2016-10-12";
  +    rev = "002cbb5f952456d0c50e0d2aff17ea5eca716979";
  +    date = "2016-10-16";
       owner  = "golang";
       repo   = "sys";
  -    sha256 = "0yhpk2qd0bfvvsmpsg7b7c822i6s6h93il8s05y4pkhxvssbb0gl";
  +    sha256 = "1fpwcx22caikv9d0i5d62g1nrcpc34lldhpsn77k6r6dla687rad";
       goPackagePath = "golang.org/x/sys";
       goPackageAliases = [
         "github.com/golang/sys"
  
positive.code: 
    text = buildFromGitHub {
      version = 2;
      rev = "c745997bb18563e8788428768ce0f034f2b663df";
      date = "2016-10-12";
      owner = "golang";
      repo = "text";
      sha256 = "1d128bn858n6q9h6736ash2qdp8b2zya4cj26wxxh0hwrkkz3j63";
      goPackagePath = "golang.org/x/text";
      goPackageAliases = [ "github.com/golang/text" ];
      excludedPackages = "cmd";
  
negative.code:   };
  
    gomemcached = buildFromGitHub {
      version = 2;
      rev = "9705ad8d185ee1c55130f94024676ac490007ba7";
      date = "2016-09-29";
      owner = "couchbase";
      repo = "gomemcached";
      sha256 = "1spjd321fms46fjrkxvyfc96hshhc66r04k6d8gr6fc970rr7gqy";
      propagatedBuildInputs = [
        goutils_logging
      ];
  