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40 lines
1.2 KiB
JavaScript
40 lines
1.2 KiB
JavaScript
// Copyright (C) 2020 Rick Waldron. 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-setmutablebinding-n-v-s
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description: >
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Compound Assignment Operator calls PutValue(lref, v) (formerly S11.13.2_A5.5_T5)
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info: |
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The concrete Environment Record method SetMutableBinding for object Environment
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Records attempts to set the value of the Environment Record's associated binding
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object's property whose name is the value of the argument N to the value of argument V.
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A property named N normally already exists but if it does not or is not currently writable,
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error handling is determined by the value of the Boolean argument S.
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Let stillExists be ? HasProperty(bindings, N).
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If stillExists is false and S is true, throw a ReferenceError exception.
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flags: [noStrict]
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---*/
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var count = 0;
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Object.defineProperty(this, "x", {
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configurable: true,
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get: function() {
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delete this.x;
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return 2;
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}
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});
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(function() {
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"use strict";
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assert.throws(ReferenceError, () => {
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count++;
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x -= 1;
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count++;
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});
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count++;
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})();
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assert.sameValue(count, 2);
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assert(!('x' in this));
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