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    <title>Special named constants</title>
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    <section class="sect1" title="Special named constants" epub:type="subchapter" id="Special-named-constants">
      <div class="titlepage">
        <div>
          <div>
            <h2 class="title" style="clear: both">Special named constants</h2>
          </div>
        </div>
      </div>
      <p class="synopsis" kind="Constant"><span class="kind">Constant</span><span class="ignore">: </span><a id="idm139667877539648" class="indexterm"/> <code class="varname">#!optional</code></p>
      <div class="blockquote">
        <blockquote class="blockquote">
          <p>Special self-evaluating literal used in lambda parameter lists
before optional parameters.
</p>
        </blockquote>
      </div>
      <p class="synopsis" kind="Constant"><span class="kind">Constant</span><span class="ignore">: </span><a id="idm139667877536560" class="indexterm"/> <code class="varname">#!rest</code></p>
      <div class="blockquote">
        <blockquote class="blockquote">
          <p>Special self-evaluating literal used in lambda parameter lists
before the rest parameter.
</p>
        </blockquote>
      </div>
      <p class="synopsis" kind="Constant"><span class="kind">Constant</span><span class="ignore">: </span><a id="idm139667877533520" class="indexterm"/> <code class="varname">#!key</code></p>
      <div class="blockquote">
        <blockquote class="blockquote">
          <p>Special self-evaluating literal used in lambda parameter lists
before keyword parameters.
</p>
        </blockquote>
      </div>
      <p class="synopsis" kind="Constant"><span class="kind">Constant</span><span class="ignore">: </span><a id="idm139667877530480" class="indexterm"/> <code class="varname">#!eof</code></p>
      <div class="blockquote">
        <blockquote class="blockquote">
          <p>The end-of-file object.
</p>
          <p>Note that if the Scheme reader sees this literal at top-level,
it is returned literally.  This is indistinguishable from
coming to the end of the input file.  If you do not want to end reading,
but want the actual value of <code class="literal">#!eof</code>, you should quote it.
</p>
        </blockquote>
      </div>
      <p class="synopsis" kind="Constant"><span class="kind">Constant</span><span class="ignore">: </span><a id="idm139667877526432" class="indexterm"/> <code class="varname">#!void</code></p>
      <div class="blockquote">
        <blockquote class="blockquote">
          <p>The void value.  Same as <code class="literal">(values)</code>.
If this is the value of an expression in a read-eval-print loop,
nothing is printed.
</p>
        </blockquote>
      </div>
      <p class="synopsis" kind="Constant"><span class="kind">Constant</span><span class="ignore">: </span><a id="idm139667877522944" class="indexterm"/> <code class="varname">#!null</code></p>
      <div class="blockquote">
        <blockquote class="blockquote">
          <p>The Java <code class="literal">null</code> value.  This is not really a Scheme value,
but is useful when interfacing to low-level Java code.
</p>
        </blockquote>
      </div>
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