"n">typeguard</span> <span class="o">=&gt;</span> <span class="n">example_guard</span>
  <span class="k">end type </span><span class="n">example_container</span>

<span class="k">contains</span>

<span class="k">  </span><span class="kt">logical </span><span class="k">function </span><span class="n">example_guard</span><span class="p">(</span><span class="n">this</span><span class="p">,</span> <span class="n">lhs</span><span class="p">)</span> <span class="k">result</span><span class="p">(</span><span class