> <span class="identifier">msg</span><span class="special">,</span>
    <span class="identifier">error_code</span><span class="special">&amp;</span> <span class="identifier">ec</span><span class="special">)</span>
<span class="special">{</span>
    <span class="comment">// Create the message parser</span>
    <span class="comment">//</span>
    <span class="comment">// Arguments passed to the parser's constructor are</span>
    <span class="comment">// forwarded to the message constructor. Here, we use</spa