l>
<ul>
<li><code class="code"><span class="keywordsign">'</span>e</code> is the type of the receiver function for the <code class="code">scanf</code>-style functions.</li>
</ul>
<ul>
<li><code class="code"><span class="keywordsign">'</span>f</code> is the final result type of a formatted input/output function
      invocation: for the <code class="code">printf</code>-style functions, it is typically <code class="code">unit</code>;
      for the <code class="code">scanf</code>-style functions, it is typical