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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.
51 lines
1.2 KiB
JavaScript
51 lines
1.2 KiB
JavaScript
// Copyright (C) 2015 André Bargull. 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 MemberExpression's reference (undefined)
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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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function DummyError() { }
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assert.throws(DummyError, function() {
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var base = undefined;
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var prop = function() {
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throw new DummyError();
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};
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var expr = function() {
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$ERROR("right-hand side expression evaluated");
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};
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base[prop()] = expr();
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});
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assert.throws(DummyError, function() {
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var base = undefined;
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var prop = {
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toString: function() {
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$ERROR("property key evaluated");
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}
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};
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var expr = function() {
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throw new DummyError();
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};
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base[prop] = expr();
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});
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