anchor.diff:      version = 2;
       owner = "ncw";
       repo = "rclone";
  -    rev = "69a15ae1739e9bd8b92f5571e0a625f892ef76ec";
  -    sha256 = "1as8zfj038dr7vpg7114mci84xnj6lh5vx21l34ljahff2av2p29";
  +    rev = "5fba9132071b8696cb9ae595f2bf700f2ec62403";
  +    sha256 = "008is871bv3y55arikqpi2pvwqy2y7gpik8x4yzn0n85hr90x58b";
       propagatedBuildInputs = [
         aws-sdk-go
         cobra
  
positive.code:       testify
      ];
      meta.useUnstable = true;
      date = "2017-02-17";
    };
  
    cupcake_rdb = buildFromGitHub {
  
negative.code: 
    sys = buildFromGitHub {
      version = 2;
      rev = "76cc09b634294339fa19ec41b5f2a0b3932cea8b";
      date = "2017-03-01";
      owner  = "golang";
      repo   = "sys";
      sha256 = "0vn8whgr4ci43bdga8x0knii6p0r5k4afdw0zmn7iixyw1psrm6f";
      goPackagePath = "golang.org/x/sys";
      goPackageAliases = [
        "github.com/golang/sys"
  