anchor.diff:  
     ipfs = buildFromGitHub {
       version = 2;
  -    date = "2016-09-28";
  -    rev = "0ac1fd1a8a88db47af26a508e3e010c6a7d007f9";
  +    date = "2016-10-03";
  +    rev = "c7a851bb9de4f10eaf9f90ee2c50374e225cb31e";
       owner = "ipfs";
       repo = "go-ipfs";
  -    sha256 = "15szdwjrzbfn5jxycpry1h5xcycr6zvmxnn7zzbx02bnp2hb7zbr";
  -    gxSha256 = "1cgmi27r5gpx71aqbdcak4ryjq5njygmbj3323kh78xmk3mqlsfn";
  +    sha256 = "1swbw33bi7v8ysvndsqp41y9aybv19jj90phvnw6lv1568r10fli";
  +    gxSha256 = "189sxcj5k85q3w5b9i7064vp6cp4hg6akwi3zqzsq7d0n67cvbc4";
       subPackages = [
         "cmd/ipfs"
         "cmd/ipfswatch"
  
positive.code: 
    gcloud-golang = buildFromGitHub {
      version = 2;
      date = "2016-09-30";
      rev = "90296fd601ebfc594192e722a022663b0c3f8756";
      owner = "GoogleCloudPlatform";
      repo = "gcloud-golang";
      sha256 = "1vb2ld2dl0yd3f9bjgqj99rbi3y74lfl08c0xi4h1l29mn0i4gy2";
      goPackagePath = "cloud.google.com/go";
      goPackageAliases = [
        "google.golang.org/cloud"
  
negative.code: 
    text = buildFromGitHub {
      version = 2;
      rev = "098f51fb687dbaba1f6efabeafbb6461203f9e21";
      date = "2016-09-28";
      owner = "golang";
      repo = "text";
      sha256 = "1xy5igz3am7iqlxwv7gqvy77838839vjs2qsmbhbjr2a1is0gyr7";
      goPackagePath = "golang.org/x/text";
      goPackageAliases = [ "github.com/golang/text" ];
      excludedPackages = "cmd";
  