 class="special">)</span> <span class="keyword">const</span>
    <span class="special">{</span>
        <span class="keyword">while</span> <span class="special">(!</span><span class="identifier">f</span> <span class="special">(</span><span class="identifier">subject</span><span class="special">))</span>
            <span class="special">;</span>
        <span class="keyword">return</span> <span class="keyword">true</span><span class="special">;</span>
    <span class="special">}</span>

    <span class="key