anchor.diff:  
     roaring = buildFromGitHub {
       version = 2;
  -    rev = "v0.2.7";
  +    rev = "v0.2.8";
       owner  = "RoaringBitmap";
       repo   = "roaring";
  -    sha256 = "03h1r15yswfzpr1f43wjlmj6q8lvjl42kfhyyd4i80hwvbrgnay0";
  +    sha256 = "1hkm77ghjqlw2jzdvcqqa4yjxqk06xbdjhr4bc819vdgmshhijaf";
     };
   
     rpc = buildFromGitHub {
  
positive.code: 
    text = buildFromGitHub {
      version = 2;
      rev = "04b8648d973c126ae60143b3e1473bc1576c7597";
      date = "2016-09-15";
      owner = "golang";
      repo = "text";
      sha256 = "01a5nxvg10rznv0knc1mim3canxjak0s26g1q940q9shzxrp3i2s";
      goPackagePath = "golang.org/x/text";
      goPackageAliases = [ "github.com/golang/text" ];
    };
  
negative.code:     repo   = "go-ipfs-api";
      sha256 = "0c54r9g10rcnrm9rzj815gjkcgmr5z3pjgh3b4b19vbsgm2rx7hf";
      excludedPackages = "tests";
      propagatedBuildInputs = [
        go-multiaddr
        go-multiaddr-net
        go-multipart-files
        tar-utils
      ];
    };
  
    go-isatty = buildFromGitHub {
  