mirror of https://github.com/tc39/test262.git
56 lines
1.4 KiB
JavaScript
56 lines
1.4 KiB
JavaScript
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// Copyright (C) 2016 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-generator-function-definitions-runtime-semantics-evaluation
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es6id: 14.4.14
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description: Abrupt completion returned when accessing iterator `throw` method
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info: |
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YieldExpression : yield * AssignmentExpression
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1. Let exprRef be the result of evaluating AssignmentExpression.
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2. Let value be ? GetValue(exprRef).
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3. Let iterator be ? GetIterator(value).
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4. Let received be NormalCompletion(undefined).
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5. Repeat
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a. If received.[[Type]] is normal, then
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[...]
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b. Else if received.[[Type]] is throw, then
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i. Let throw be ? GetMethod(iterator, "throw").
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features: [Symbol.iterator]
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---*/
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var thrown = new Test262Error();
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var badIter = {};
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var poisonedThrow = {
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next: function() {
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return { done: false };
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}
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};
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Object.defineProperty(poisonedThrow, 'throw', {
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get: function() {
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throw thrown;
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}
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});
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badIter[Symbol.iterator] = function() {
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return poisonedThrow;
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};
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function* g() {
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try {
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yield * badIter;
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} catch (err) {
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caught = err;
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}
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}
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var iter = g();
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var result, caught;
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iter.next();
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assert.sameValue(caught, undefined, '`throw` property not accesed eagerly');
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result = iter.throw();
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assert.sameValue(result.value, undefined);
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assert.sameValue(result.done, true);
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assert.sameValue(caught, thrown);
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