 <p class="aside-title">Note</p>
    <code>CoScope</code> keeps weak references.

</div>
<pre class="highlight swift"><code><span class="k">let</span> <span class="nv">scope</span> <span class="o">=</span> <span class="kt">CoScope</span><span class="p">()</span>

<span class="k">let</span> <span class="nv">future</span> <span class="o">=</span> <span class="nf">makeSomeFuture</span><span class="p">()</span><span class="o">.</span><span class="nf">added</span><span class="p">(</span><span class="nv">to</span