::<span class="ident">future</span>::<span class="ident">Loop</span>;
<span class="kw">use</span> <span class="ident">stm32f30x_hal</span>::{<span class="ident">Led</span>, <span class="ident">Serial1</span>, <span class="ident">Timer6</span>};
<span class="kw">use</span> <span class="ident">void</span>::<span class="ident">Void</span>;

<span class="doccomment">/// `futures` version of `CountDown.wait`</span>
<span class="doccomment">///</span>
<span class="doccomment">/// This returns a future that must b