n>
    <span class="comment">// a move construction in case the caller has constructed</span>
    <span class="comment">// their message in a non-default way.</span>
    <span class="comment">//</span>
    <span class="identifier">parser</span><span class="special">&lt;</span><span class="identifier">isRequest</span><span class="special">,</span> <span class="identifier">Body</span><span class="special">&gt;</span> <span class="identifier">p</span><span class="special">{</span><span class="identifier">std</