yn-symbol">who</span> (<span class="mdzsyn-keyword">:recv-from</span> <span class="mdzsyn-symbol">server</span> <span class="mdzsyn-number">1024</span> <span class="mdzsyn-symbol">buf</span>))
  (<span class="mdzsyn-coresym">printf</span> <span class="mdzsyn-string">"got %q from %v, echoing!"</span> <span class="mdzsyn-symbol">buf</span> <span class="mdzsyn-symbol">who</span>)
  (<span class="mdzsyn-keyword">:send-to</span> <span class="mdzsyn-symbol">server</span> <span class="mdzsyn-symbol">who</span> <sp