n</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Context</span><span class="special">&gt;</span>
    <span class="identifier">x3</span><span class="special">::</span><span class="identifier">error_handler_result</span> <span class="identifier">on_error</span><span class="special">(</span>
        <span class="identifier">Iterator</span><span class="special">&amp;</span> <span class="identifier">first</span><span class="special">,</span> <span class="ident