anchor.diff:  { stdenv, lib, fetchFromGitHub, emscripten }:
   
  -let version = "0.8.7"; in
  +let version = "0.8.9"; in
   
   stdenv.mkDerivation {
     name = "jsonnet-${version}";
  
positive.code: 
    meta = {
      description = "Purely-functional configuration language that helps you define JSON data";
      maintainers = [ lib.maintainers.benley ];
      license = lib.licenses.asl20;
      homepage = https://github.com/google/jsonnet;
      platforms = lib.platforms.unix;
  
negative.code:     rev = "v${version}";
      owner = "google";
      repo = "jsonnet";
      sha256 = "0phk8dzby5v60r7fwd1qf4as2jdpmdmksjw3g4p3mkkr7sc81119";
    };
  
    buildInputs = [ emscripten ];
  