s>[+In, ?Yield, ?Await]</emu-params><emu-opt>opt</emu-opt></emu-mods></emu-nt><emu-t>:</emu-t><emu-nt params="+In, ?Yield, ?Await" optional=""><a href="https://tc39.es/ecma262/#prod-AssignmentExpression">AssignmentExpression</a><emu-mods><emu-params>[+In, ?Yield, ?Await]</emu-params><emu-opt>opt</emu-opt></emu-mods></emu-nt><emu-t>]</emu-t></emu-rhs></ins>
</emu-production></emu-grammar>

  <emu-grammar><emu-production name="OptionalExpression" params="Yield, Await" id="prod-OptionalExpression">
    <emu-nt