ry important to
          understand that the literals don't consume any of the elements of a fusion
          sequence passed to this component sequence. As said, they just don't expose
          any attribute and don't produce (consume) any data. The following example
          shows this:
        </p>
<pre class="programlisting"><span class="comment">// the following parses "(1.0, 2.0)" into a pair of double</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier"