iv class="tmd-usual">
values of the type denoted by <code class="tmd-code-span">S2</code> can be implicitly converted to type <code class="tmd-code-span">S3</code>, and vice versa.
</div>
</li>
<li class="tmd-list-item">
<div class="tmd-usual">
values of the type denoted by <code class="tmd-code-span">S2</code> can be implicitly converted to type <code class="tmd-code-span">S4</code>, and vice versa.
</div>
</li>
</ul>
<p></p>
<div class="tmd-usual">
But,
</div>
<ul class="tmd-list">
<li class="tmd-list-ite