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// Copyright 2019 Google, Inc. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: prod-OptionalExpression
description: >
optional chaining is forbidden in write contexts
info: |
UpdateExpression[Yield, Await]:
LeftHandSideExpression++
LeftHandSideExpression--
++UnaryExpression
--UnaryExpression
features: [optional-chaining]
negative:
type: SyntaxError
phase: parse
---*/
$DONOTEVALUATE();
// --UnaryExpression
const a = {};
--a?.b;
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