mirror of https://github.com/tc39/test262.git
93 lines
2.7 KiB
JavaScript
93 lines
2.7 KiB
JavaScript
// This file was procedurally generated from the following sources:
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// - src/dstr-assignment/array-elem-trlg-iter-rest-rtrn-close-err.case
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// - src/dstr-assignment/default/for-of.template
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/*---
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description: IteratorClose is called when AssignmentRestEvaluation produces a "return" completion due to reference evaluation (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, generators, 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 :
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[ AssignmentElementList , Elisionopt AssignmentRestElementopt ]
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[...]
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7. If AssignmentRestElement is present, then
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a. Let status be the result of performing
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IteratorDestructuringAssignmentEvaluation of AssignmentRestElement
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with iteratorRecord as the argument.
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8. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
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status).
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9. Return Completion(status).
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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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---*/
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var nextCount = 0;
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var returnCount = 0;
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var unreachable = 0;
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var x;
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var iterable = {};
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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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returnCount += 1;
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throw new Test262Error();
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}
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};
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var iter;
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iterable[Symbol.iterator] = function() {
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return iterator;
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};
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function* g() {
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var counter = 0;
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for ([ x , ...{}[yield] ] of [iterable]) {
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unreachable += 1;
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counter += 1;
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}
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assert.sameValue(counter, 1);
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}
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iter = g();
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iter.next();
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assert.throws(Test262Error, function() {
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iter.return();
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});
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assert.sameValue(nextCount, 1);
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assert.sameValue(returnCount, 1);
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assert.sameValue(unreachable, 0, 'Unreachable statement was not executed');
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