anchor.diff:  
     go-ethereum = buildFromGitHub {
       version = 2;
  -    date = "2017-02-28";
  -    rev = "167be7f260763bb21e703d304b553142d5422266";
  +    date = "2017-03-01";
  +    rev = "c52ab932e61ef9eba37c107e8b58b22c7d32e6c2";
       owner  = "ethereum";
       repo   = "go-ethereum";
  -    sha256 = "1mq33l0nf2f8jdgjs0rp4aglzfjs172q90ipgxayygk50i59rn29";
  +    sha256 = "1b2yaq017vz3j96gz7vkvqi6yzsn4hq816d2k24w6rsv11a2lqhs";
       subPackages = [
         "crypto/sha3"
       ];
  
positive.code: 
    tools = buildFromGitHub {
      version = 2;
      rev = "718875e4f9a39b5a303f3fa67a7dd9367b07c02f";
      date = "2017-02-28";
      owner = "golang";
      repo = "tools";
      sha256 = "1sj767i7ipwnwvvmy8b5j5iv6incahbmsmq0l85q8xjj9wx2mhqg";
      goPackagePath = "golang.org/x/tools";
      goPackageAliases = [ "code.google.com/p/go.tools" ];
  
  
negative.code: 
    go-ipfs-api = buildFromGitHub {
      version = 2;
      rev = "57e8d73c27b8e64b8d025bc24afa0439ccca309a";
      owner  = "ipfs";
      repo   = "go-ipfs-api";
      sha256 = "0wwk2xywpmzcifi56bmhn6d37x4mvrf6hwb9k7xsj90mlh34an2w";
      excludedPackages = "tests";
      propagatedBuildInputs = [
        go-floodsub
  