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b3092c61b6
* Add missing generators feature flags * Generate files * Add generators flags * fixup! Add generators flags
61 lines
1.7 KiB
JavaScript
61 lines
1.7 KiB
JavaScript
// 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: >
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`value` property is not accessed when iteration is incomplete
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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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i. Let innerResult be ? IteratorNext(iterator, received.[[Value]]).
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ii. Let done be ? IteratorComplete(innerResult).
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iii. If done is true, then
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1. Return ? IteratorValue(innerResult).
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features: [generators, Symbol.iterator]
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---*/
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var badIter = {};
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var callCount = 0;
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var spyValue = Object.defineProperty({ done: false }, 'value', {
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get: function() {
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callCount += 1;
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}
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});
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badIter[Symbol.iterator] = function() {
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return {
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next: function() {
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return spyValue;
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}
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};
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};
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var delegationComplete = false;
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function* g() {
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yield * badIter;
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delegationComplete = true;
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}
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var iter = g();
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iter.next();
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assert.sameValue(callCount, 0, 'access count (first iteration)');
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assert.sameValue(
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delegationComplete, false, 'delegation ongoing (first iteration)'
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);
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iter.next();
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assert.sameValue(callCount, 0, 'access count (second iteration)');
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assert.sameValue(
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delegationComplete, false, 'delegation ongoing (second iteration)'
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);
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spyValue.done = true;
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iter.next();
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assert.sameValue(callCount, 1, 'access count (final iteration)');
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assert.sameValue(delegationComplete, true, 'delegation complete');
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