// |reftest| async // This file was procedurally generated from the following sources: // - src/dstr-assignment-for-await/array-elem-trlg-iter-elision-iter-nrml-close-null.case // - src/dstr-assignment-for-await/default/async-gen-decl.template /*--- description: IteratorClose throws a TypeError when `return` returns a non-Object value (for-await-of statement in an async generator declaration) esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation features: [Symbol.iterator, destructuring-binding, async-iteration] flags: [generated, async] info: | IterationStatement : for await ( LeftHandSideExpression of AssignmentExpression ) Statement 1. Let keyResult be the result of performing ? ForIn/OfHeadEvaluation(« », AssignmentExpression, iterate). 2. Return ? ForIn/OfBodyEvaluation(LeftHandSideExpression, Statement, keyResult, assignment, labelSet). 13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation [...] 5. If destructuring is true and if lhsKind is assignment, then a. Assert: lhs is a LeftHandSideExpression. b. Let assignmentPattern be the parse of the source text corresponding to lhs using AssignmentPattern as the goal symbol. [...] ArrayAssignmentPattern : [ AssignmentElementList , Elisionopt AssignmentRestElementopt ] [...] 6. If Elision is present, then a. Let status be the result of performing IteratorDestructuringAssignmentEvaluation of Elision with iteratorRecord as the argument. b. If status is an abrupt completion, then [...] 8. If iteratorRecord.[[done]] is false, return IteratorClose(iterator, status). 7.4.6 IteratorClose( iterator, completion ) [...] 6. Let innerResult be Call(return, iterator, « »). 7. If completion.[[type]] is throw, return Completion(completion). 8. If innerResult.[[type]] is throw, return Completion(innerResult). 9. If Type(innerResult.[[value]]) is not Object, throw a TypeError exception. ---*/ let x; let nextCount = 0; let iterator = { next() { nextCount += 1; // Set an upper-bound to limit unnecessary iteration in non-conformant // implementations return { done: nextCount > 10 }; }, return() { return null; } }; let iterable = { [Symbol.iterator]() { return iterator; } }; let iterCount = 0; async function * fn() { for await ([ x , , ] of [iterable]) { iterCount += 1; } } let promise = fn().next(); promise.then(() => $DONE('Promise incorrectly fulfilled.'), ({ constructor }) => { assert.sameValue(iterCount, 0); assert.sameValue(nextCount, 2); assert.sameValue(constructor, TypeError); }).then($DONE, $DONE);