an>(<span class="ident">try_nb</span>)]</span>
<span class="kw">extern</span> <span class="kw">crate</span> <span class="ident">nb</span>;

<span class="kw">use</span> <span class="ident">hal</span>::<span class="ident">prelude</span>::<span class="kw-2">*</span>;
<span class="kw">use</span> <span class="ident">futures</span>::{
    <span class="ident">future</span>,
    <span class="ident">Async</span>,
    <span class="ident">Future</span>,
};
<span class="kw">use</span> <span class="ident">futures</span>