"><span class="pre">constexpr</span></code>. See <a class="reference external" href="api.html#c.fmt">here</a> for details.</p>
<p>The following code</p>
<div class="code c++ highlight-c++"><div class="highlight"><pre><span></span>fmt::format(&quot;Cyrillic letter {}&quot;, L&#39;\x42e&#39;);
</pre></div>
</div>
<p>produces a compile-time error because wide character <code class="docutils literal"><span class="pre">L'\x42e'</span></code> cannot be
formatted into a narrow string. You can use a wide format str