class="mendoza-codeblock"><code data-language="janet">(<span class="mdzsyn-coresym">def</span> <span class="mdzsyn-symbol">f</span>
  (<span class="mdzsyn-coresym">ev/spawn</span>
    (<span class="mdzsyn-coresym">print</span> <span class="mdzsyn-string">"starting long io..."</span>)
    (<span class="mdzsyn-coresym">ev/sleep</span> <span class="mdzsyn-number">10000</span>)
    (<span class="mdzsyn-coresym">print</span> <span class="mdzsyn-string">"finished long io!"</span>)))

<span class="mdzsyn-comment">