">&amp;</span> <span class="identifier">m</span><span class="special">,</span>
             <span class="keyword">const</span> <span class="identifier">CompatibleKey</span>  <span class="special">&amp;</span> <span class="identifier">key</span><span class="special">,</span>
             <span class="keyword">const</span> <span class="identifier">CompatibleData</span> <span class="special">&amp;</span> <span class="identifier">data</span> <span class="special">)</span>
<span class="special">{</span>
    <spa