anchor.diff:      exportsJs = ./javascript/exports.js;
       builder = builtins.toFile "builder.sh" ''
         source $stdenv/setup
  -      $haxe/bin/haxe -cp $haxeSrc ${targets} -js compiled.js -D js-classic
  +      $haxe/bin/haxe -cp $haxeSrc ${targets} -js compiled.js -D js-classic -D js-unflatten
   
         echo '(function() {' > $out
         cat compiled.js >> $out
  
positive.code:   ruby = pkgs.ruby;
    maven = pkgs.maven;
    wheel = pkgs.python3Packages.wheel;
    twine = pkgs.python3Packages.twine;
    awscli = pkgs.python3Packages.awscli;
    nuget = pkgs.dotnetPackages.Nuget;
    openssl = pkgs.openssl;
  
negative.code: rec {
    pkgs = import (pkgsSrc) {};
    pkgsOriginal = import <nixpkgs> {};
    pkgsSrc = pkgsOriginal.fetchzip {
      url = "https://github.com/NixOS/nixpkgs/archive/dc8c798e5db19534e0a9549b7b2c4e76ccf6b8c3.zip";
      sha256 = "0272pnng388da5rpdkallc28nxjs5198hfp0ww9j33bl2ghvvai8";
    };
  
    jre = pkgs.jre;
    zip = pkgs.zip;
  