f="#prod-OptionalChain">OptionalChain</a><emu-mods><emu-params>[?Yield, ?Await]</emu-params></emu-mods></emu-nt><emu-t>[</emu-t><emu-nt params="+In, ?Yield, ?Await"><a href="https://tc39.es/ecma262/#prod-Expression">Expression</a><emu-mods><emu-params>[+In, ?Yield, ?Await]</emu-params></emu-mods></emu-nt><emu-t>]</emu-t></emu-rhs>
    <emu-rhs a="9e6f36a4"><emu-nt params="?Yield, ?Await" id="_ref_37"><a href="#prod-OptionalChain">OptionalChain</a><emu-mods><emu-params>[?Yield, ?Await]</emu-params></emu-mods