symbol">myfun</span> [<span class="mdzsyn-symbol">x</span> <span class="mdzsyn-symbol">y</span>]
 (<span class="mdzsyn-coresym">+</span> <span class="mdzsyn-symbol">x</span> <span class="mdzsyn-symbol">x</span> <span class="mdzsyn-symbol">y</span>))

<span class="mdzsyn-comment"># You can think of defn as a shorthand for def and fn together</span>
(<span class="mdzsyn-coresym">def</span> <span class="mdzsyn-symbol">myfun-same</span> (<span class="mdzsyn-coresym">fn</span> [<span class="mdzsyn-symbol">x</spa