an class="mdzsyn-coresym">resume</span> <span class="mdzsyn-symbol">f</span>))

(<span class="mdzsyn-coresym">if</span> (<span class="mdzsyn-coresym">=</span> (<span class="mdzsyn-coresym">fiber/status</span> <span class="mdzsyn-symbol">f</span>) <span class="mdzsyn-keyword">:error</span>)
 (<span class="mdzsyn-coresym">print</span> <span class="mdzsyn-string">"caught error: "</span> <span class="mdzsyn-symbol">res</span>)
 (<span class="mdzsyn-coresym">print</span> <span class="mdzsyn-string">"value return