cial&amp;colorA=999999" /></a> <a class="reference external" href="http://www.lispworks.com/documentation/HyperSpec/Body/f_elt.htm"><img alt="clhs" src="https://img.shields.io/badge/CLHS-ELT-5f9ea0.svg?style=social&amp;colorA=999999" /></a></p>
<blockquote>
<div>Replaces the element at position INDEX of SEQUENCE with NEW-VALUE
and returns NEW-VALUE or signals a PROTOCOL-UNIMPLEMENTED error if
the sequence protocol is not implemented for the class of
SEQUENCE.</div></blockquote>
<div class="section" id="lamb