public static void testTagbody() {
    var ref = new Object() {
      boolean continueRunning = true;
    };
    Tag tag1 = tag(), tag2 = tag();
    TagbodyElement code1 = () -> {
      if (ref.continueRunning) {
        ref.continueRunning = false;
        go(tag1);
      } else {
        go(tag2);
      }
    };
    tagbody(() -> System.out.println("Hello world!"),
            tag1,
            () -> System.out.println("This should get printed twice"),
            code1,
            () -> System.out.println("This will not get printed"),
            tag2,
            () -> System.out.println("Goodbye world!"));
  }

/*

Hello world!
This should get printed twice
This should get printed twice
Goodbye world!

*/