ose possibly blocking APIs that can't fail. In
those cases <code>nb::Result&lt;_, Void&gt;</code> is used.</p>

<div class="example-wrap"><pre class="rust rust-example-rendered">
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">nb</span>;
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">void</span>;

<span class="kw">use</span> <span class="ident">void</span>::<span class="ident">Void</span>;

<span class="doccomment">/// A count down timer</sp