s="string">"fmt:&nbsp;%{%i%}"</span></code>
      succeeds and returns the format string <code class="code"><span class="string">"number&nbsp;is&nbsp;%u"</span></code>.</li>
<li><code class="code">(&nbsp;fmt&nbsp;%)</code>: scanning sub-format substitution.
      Reads a format string <code class="code">rf</code> in the input, then goes on scanning with
      <code class="code">rf</code> instead of scanning with <code class="code">fmt</code>.
      The format string <code class="code">rf</code> must have th