</span> <span class="identifier">a</span> <span class="special">*</span> <span class="identifier">b</span><span class="special">;</span> <span class="comment">// Error, implicit conversion could go either way.</span>
<span class="identifier">b</span> <span class="special">=</span> <span class="identifier">a</span> <span class="special">*</span> <span class="number">3.14</span><span class="special">;</span> <span class="comment">// Error, no operator overload if the conversion would be explicit.</span>
</pre