mirror of https://github.com/tc39/test262.git
73 lines
2.1 KiB
JavaScript
73 lines
2.1 KiB
JavaScript
// This file was procedurally generated from the following sources:
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// - src/dstr-assignment/array-elem-iter-nrml-close-null.case
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// - src/dstr-assignment/error/for-of.template
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/*---
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description: IteratorClose throws a TypeError when `return` returns a non-Object value (For..of statement)
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esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation
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es6id: 13.7.5.11
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features: [Symbol.iterator, destructuring-binding]
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flags: [generated]
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info: |
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IterationStatement :
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for ( LeftHandSideExpression of AssignmentExpression ) Statement
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1. Let keyResult be the result of performing ? ForIn/OfHeadEvaluation(« »,
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AssignmentExpression, iterate).
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2. Return ? ForIn/OfBodyEvaluation(LeftHandSideExpression, Statement,
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keyResult, assignment, labelSet).
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13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation
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[...]
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4. If destructuring is true and if lhsKind is assignment, then
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a. Assert: lhs is a LeftHandSideExpression.
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b. Let assignmentPattern be the parse of the source text corresponding to
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lhs using AssignmentPattern as the goal symbol.
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[...]
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ArrayAssignmentPattern : [ AssignmentElementList ]
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[...]
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5. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
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result).
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6. Return result.
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7.4.6 IteratorClose( iterator, completion )
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[...]
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6. Let innerResult be Call(return, iterator, « »).
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7. If completion.[[type]] is throw, return Completion(completion).
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8. If innerResult.[[type]] is throw, return Completion(innerResult).
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9. If Type(innerResult.[[value]]) is not Object, throw a TypeError
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exception.
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---*/
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var _;
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var iterable = {};
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var nextCount = 0;
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var iterator = {
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next: function() {
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nextCount += 1;
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// Set an upper-bound to limit unnecessary iteration in non-conformant
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// implementations
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return { done: nextCount > 10 };
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},
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return: function() {
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return null;
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}
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};
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iterable[Symbol.iterator] = function() {
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return iterator;
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};
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var counter = 0;
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assert.throws(TypeError, function() {
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for ([ _ ] of [iterable]) {
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counter += 1;
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}
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counter += 1;
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});
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assert.sameValue(counter, 0);
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