span><span class='macro'>!</span>[<span class='number'>1</span>, <span class='number'>2</span>, <span class='number'>3</span>];
<span class='kw'>let</span> <span class='ident'>three</span> <span class='op'>=</span> <span class='ident'>v</span>[<span class='number'>2</span>];
<span class='ident'>v</span>[<span class='number'>1</span>] <span class='op'>=</span> <span class='ident'>v</span>[<span class='number'>1</span>] <span class='op'>+</span> <span class='number'>5</span>;</pre>
</div><h2 id='structs' clas