anchor.diff:  
     roaring = buildFromGitHub {
       version = 2;
  -    rev = "v0.3.1";
  +    rev = "v0.3.2";
       owner  = "RoaringBitmap";
       repo   = "roaring";
  -    sha256 = "1859c4p12vqsp03k1pvb1056f279sdf52hhjh1ny7wy26rgv0prp";
  +    sha256 = "0164igv8r3pq493ws0d4d1nyn2nvb6jdszrqzi9bmla5pb0flkyw";
       propagatedBuildInputs = [
         go-unsnap-stream
         msgp
  
positive.code: 
    msgp = buildFromGitHub {
      version = 2;
      rev = "b433144bef5f20ebd771c0872945f6707ed3f178";
      owner  = "tinylib";
      repo   = "msgp";
      sha256 = "1w81p2pjr6cxyly6zir3z9pz3fm6nymmsz26iirhlwr8306w08xh";
      date = "2016-12-17";
      propagatedBuildInputs = [
        fwd
        chalk
  
negative.code: 
    ipfs = buildFromGitHub {
      version = 2;
      date = "2016-12-21";
      rev = "99d72c27818353eb2b9c05710a9a8eba87518323";
      owner = "ipfs";
      repo = "go-ipfs";
      sha256 = "0bq6ci1gbld1f2h4wdxppw74pzr73z8c9digqz199ilj4qakkdyi";
      gxSha256 = "0qg7yrjjski84wp9apzhd25v3ljkgxg1vl1hm6xnb392pnxx9qiw";
      subPackages = [
        "cmd/ipfs"
        "cmd/ipfswatch"
  