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These tests support the following normative change "Normative: Allow null or undefined in Reference Records" https://github.com/tc39/ecma262/pull/2267 The tests concerning the `delete` operator increase coverage to verify behavior which, though related, is not altered by the normative change. These tests are intended to guard against regressions as engines implement the new semantics.
38 lines
939 B
JavaScript
38 lines
939 B
JavaScript
// Copyright (C) 2021 the V8 project authors. 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-assignment-operators
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description: Assignment Operator evaluates the value prior validating a SuperProperty's reference (null)
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info: |
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# 13.15.2 Runtime Semantics: Evaluation
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AssignmentExpression : LeftHandSideExpression = AssignmentExpression
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1. If LeftHandSideExpression is neither an ObjectLiteral nor an ArrayLiteral,
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then
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a. Let lref be the result of evaluating LeftHandSideExpression.
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[...]
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e. Perform ? PutValue(lref, rval).
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# 6.2.4.5 PutValue ( V, W )
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[...]
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5. If IsPropertyReference(V) is true, then
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a. Let baseObj be ? ToObject(V.[[Base]]).
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---*/
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var count = 0;
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class C {
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static m() {
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super[0] = count += 1;
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}
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}
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Object.setPrototypeOf(C, null);
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assert.throws(TypeError, function() {
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C.m();
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});
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assert.sameValue(count, 1);
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