="identifier">a</span></code>i is an LValue,
                same as <code class="computeroutput"><span class="identifier">A</span></code>i, otherwise
              </p></dd>
</dl>
</div>
<h6>
<a name="fusion.functional.concepts.def_callable.h2"></a>
          <span class="phrase"><a name="fusion.functional.concepts.def_callable.expression_requirements"></a></span><a class="link" href="def_callable.html#fusion.functional.concepts.def_callable.expression_requirements">Expression
          requirements</a>
  