an <code>&amp;&#39;a str</code> would have been if it was in a field of the
<code>&amp;&#39;a u32</code>, which is obviously not the case.</p>

<p>(Actually we could have also just returned a string literal, which as a global
can be considered to reside at the bottom of the stack; though this limits
our implementation <em>just a bit</em>.)</p>

<h1 id='example-aliasing-a-mutable-reference' class='section-header'><a href='#example-aliasing-a-mutable-reference'>Example: aliasing a mutable reference</a></h1>
<