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52 lines
1.4 KiB
JavaScript
52 lines
1.4 KiB
JavaScript
// Copyright (C) 2015 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-runtime-semantics-forin-div-ofheadevaluation-tdznames-expr-iterationkind
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description: >
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If the left-hand side requires a DestructuringAssignment operation and that
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operation produces an error, the iterator should be closed and the error
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forwarded to the runtime.
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info: |
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...
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Else,
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If lhsKind is assignment, then
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Let status be the result of performing DestructuringAssignmentEvaluation of
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assignmentPattern using nextValue as the argument.
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...
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If status is an abrupt completion, then
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Set the running execution context's LexicalEnvironment to oldEnv.
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If iterationKind is enumerate, then
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Return status.
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features: [destructuring-assignment, for-of, Symbol.iterator]
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---*/
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var callCount = 0;
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var iterationCount = 0;
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var iterable = {};
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var x = {
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set attr(_) {
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throw new Test262Error();
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}
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};
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iterable[Symbol.iterator] = function() {
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return {
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next: function() {
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return { done: false, value: [0] };
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},
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return: function() {
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callCount += 1;
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}
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}
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};
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assert.throws(Test262Error, function() {
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for ([x.attr] of iterable) {
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iterationCount += 1;
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}
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});
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assert.sameValue(iterationCount, 0, 'The loop body is not evaluated');
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assert.sameValue(callCount, 1, 'Iterator is closed');
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