ment">   * Move-assigns from `src`; `*this` acts as if destructed; `src` becomes as-if default-cted (therefore in NULL state).</span></div>
<div class="line"><a id="l00247" name="l00247"></a><span class="lineno">  247</span><span class="comment">   * No-op if `&amp;src == this`.</span></div>
<div class="line"><a id="l00248" name="l00248"></a><span class="lineno">  248</span><span class="comment">   *</span></div>
<div class="line"><a id="l00249" name="l00249"></a><span class="lineno">  249</span><span class