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// Copyright 2019 Google, LLC. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: prod-OptionalExpression
description: >
optional chain in test portion of do while statement
info: |
IterationStatement
for (LeftHandSideExpression in Expression) Statement
features: [optional-chaining]
---*/
const obj = {
inner: {
a: 1,
b: 2
}
};
let str = '';
for (const key in obj?.inner) {
str += key;
}
assert.sameValue('ab', str);
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