pan class="mdzsyn-symbol">my-adder</span>
 <span class="mdzsyn-string">"Adds numbers in a dubious way."</span>
 [<span class="mdzsyn-symbol">&amp;</span> <span class="mdzsyn-symbol">xs</span>]
 (<span class="mdzsyn-coresym">var</span> <span class="mdzsyn-symbol">accum</span> <span class="mdzsyn-number">0</span>)
 (<span class="mdzsyn-coresym">each</span> <span class="mdzsyn-symbol">x</span> <span class="mdzsyn-symbol">xs</span>
  (<span class="mdzsyn-coresym">+=</span> <span class="mdzsyn-symbol">accum</spa