anchor.diff:  
     net = buildFromGitHub {
       version = 3;
  -    rev = "01c190206fbdffa42f334f4b2bf2220f50e64920";
  -    date = "2017-11-02";
  +    rev = "a337091b0525af65de94df2eb7e98bd9962dcbe2";
  +    date = "2017-11-07";
       owner = "golang";
       repo = "net";
  -    sha256 = "0pr8wfp90d3ca5pkzgvw6bmsaf7f05mjpvrvi7ph0f8mdk0mhfyq";
  +    sha256 = "073hxgls9yj93m863229rs844v3vck04pzcq332ygrs3innp5ri1";
       goPackagePath = "golang.org/x/net";
       goPackageAliases = [
         "github.com/hashicorp/go.net"
  
positive.code: 
    aws-sdk-go = buildFromGitHub {
      version = 3;
      rev = "v1.12.22";
      owner  = "aws";
      repo   = "aws-sdk-go";
      sha256 = "1jv9ff54ws3jqncanwg05gdqdjlysywxiwjf95lqvi4aka5blk1b";
      excludedPackages = "\\(awstesting\\|example\\)";
      buildInputs = [
        tools
  
negative.code: 
    tools = buildFromGitHub {
      version = 3;
      rev = "9c477bae194915bfd4bc8c314e90e28b9ec1c831";
      date = "2017-11-10";
      owner = "golang";
      repo = "tools";
      sha256 = "0lkcy3ifyzcgkza47n1xv2mhzz9031sgws387sprbg0i9jnxq9ch";
      goPackagePath = "golang.org/x/tools";
  
      preConfigure = ''
  