l" class="link has-adjacent-elements">
                  <code class="decorated-title"><span class='decorator'>func</span><span class='decorator empty-token'> </span><span class='identifier'>mutate</span><span class='decorator'>&lt;</span><span class='decorator'>Result</span><span class='decorator'>&gt;(</span><span class='decorator'>when</span><span class='decorator'>: (</span><span class='decorator'>Result</span><span class='decorator'>) -&gt; </span><span class='decorator'>Bool</span><span class='decorat