mirror of https://github.com/tc39/test262.git
52 lines
1.3 KiB
JavaScript
52 lines
1.3 KiB
JavaScript
// Copyright (C) 2017 Mozilla Corporation. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-object-environment-records-hasbinding-n
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description: >
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@@unscopables should be looked up exactly once for inc/dec.
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info: |
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UpdateExpression : LeftHandSideExpression ++
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1. Let lhs be the result of evaluating LeftHandSideExpression.
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GetIdentifierReference ( lex, name, strict )
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[...]
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3. Let exists be ? envRec.HasBinding(name).
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HasBinding ( N )
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[...]
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6. Let unscopables be ? Get(bindings, @@unscopables).
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flags: [noStrict]
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features: [Symbol.unscopables]
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---*/
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var unscopablesGetterCalled = 0;
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var a, b, flag = true;
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with (a = { x: 7 }) {
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with (b = { x: 4, get [Symbol.unscopables]() {
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unscopablesGetterCalled++;
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return { x: flag=!flag };
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} }) {
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x++;
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}
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}
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assert.sameValue(unscopablesGetterCalled, 1);
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assert.sameValue(a.x, 7);
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assert.sameValue(b.x, 5);
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unscopablesGetterCalled = 0;
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flag = true;
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with (a = { x: 7 }) {
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with (b = { x: 4, get [Symbol.unscopables]() {
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unscopablesGetterCalled++;
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return { x: flag=!flag };
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} }) {
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x--;
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}
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}
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assert.sameValue(unscopablesGetterCalled, 1);
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assert.sameValue(a.x, 7);
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assert.sameValue(b.x, 3);
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