ode">:range</code>) and modifiers
(<code class="mendoza-code">:when</code>) that let the programmer more easily generate common looping
idioms. The <code class="mendoza-code">loop</code> macro is similar to the Common Lips <code class="mendoza-code">loop</code> macro,
but smaller in scope and with a much simpler syntax. As with the <code class="mendoza-code">for</code>
macro, the <code class="mendoza-code">loop</code> macro expands to similar code as our original
<code class="mendoza-code">while</code> expr