 class="mdzsyn-symbol">block</span> <span class="mdzsyn-keyword">:e</span>))

<span class="mdzsyn-comment"># Get result of resuming the fiber in res.</span>
<span class="mdzsyn-comment"># Because the fiber f traps only errors, we know</span>
<span class="mdzsyn-comment"># that after resume returns, f either exited normally</span>
<span class="mdzsyn-comment"># (has status :dead), or threw an error (has status :error)</span>
(<span class="mdzsyn-coresym">def</span> <span class="mdzsyn-symbol">res</span> (<sp