</emu-mods></emu-nt><emu-t>:</emu-t><emu-nt optional=""><a href="https://tc39.es/ecma262/#prod-AssignmentExpression">AssignmentExpression</a><emu-mods><emu-opt>opt</emu-opt></emu-mods></emu-nt><emu-t>]</emu-t></emu-rhs>
</emu-production></emu-grammar>
    <emu-alg><ol><li>Return <emu-const>invalid</emu-const>.</li></ol></emu-alg>
  </emu-clause>

  <emu-clause id="sec-slice-notation-runtime-semantics-evaluation">
    <h1><span class="secnum">7.2</span> Runtime Semantics</h1>
    <emu-clause id="sec-evaluate