code: @Override
      public void execute() {
          for (Task t : tasks) {
              if (t instanceof UnknownElement) {
                  t.maybeConfigure();
                  Object proxy = ((UnknownElement) t).getWrapper().getProxy();
                  if (proxy instanceof AbstractTaskElement) {
                      ((AbstractTaskElement) proxy).setExpect(expect);
                  }
              }
          }
          super.execute();
      }
docs: {@inheritDoc}
  <p/>
  Passes the {@code expect} instance to the children tasks that are instanceof
  {@link net.sf.expectit.ant.matcher.AbstractTaskElement}.