anchor.diff:  { stdenv, fetchFromGitHub, tzdata, iana-etc, go_bootstrap, runCommand, writeScriptBin
   , perl, which, pkgconfig, patch, fetchpatch
  -, pcre, cacert
  +, pcre, cacert, llvm
   , Security, Foundation, bash }:
   
   let
  
positive.code:       ./ssl-cert-file-1.8.patch
        ./creds-test.patch
        ./remove-test-pie-1.8.patch
  
        # This test checks for the wrong thing with recent tzdata. It's been fixed in master but the patch
        # works fine here for now.
        (fetchpatch {
          url    = "https://github.com/golang/go/commit/91563ced5897faf729a34be7081568efcfedda31.patch";
          sha256 = "1ny5l3f8a9dpjjrnjnsplb66308a0x13sa0wwr4j6yrkc8j4qxqi";
        })
      ];
  
    NIX_SSL_CERT_FILE = "${cacert}/etc/ssl/certs/ca-bundle.crt";
  
  
negative.code: 
  stdenv.mkDerivation rec {
    name = "go-${version}";
    version = "1.8.1";
  
    src = fetchFromGitHub {
      owner = "golang";
      repo = "go";
      rev = "go${version}";
      sha256 = "1157mmzjpk887cpcpn2qy9c69anc22c4p3cjpl84zl7an41x660j";
    };
  
    # perl is used for testing go vet
  