h2>
<p>Types which are <a href="core/marker/trait.Sync.html"><code>Sync</code></a> are thread-safe when multiple shared
references to them are used concurrently. Types which are not <code>Sync</code> are not
thread-safe, and thus when used in a global require unsafe code to use.</p>

<h3 id='if-mutable-static-items-that-implement-sync-are-safe-why-is-taking-mut-sharable-unsafe' class='section-header'><a href='#if-mutable-static-items-that-implement-sync-are-safe-why-is-taking-mut-sharable-unsafe'>1.3.1 If m