// |reftest| async // This file was procedurally generated from the following sources: // - src/dstr-binding-for-await/ary-ptrn-rest-ary-elision.case // - src/dstr-binding-for-await/default/for-await-of-async-gen-var.template /*--- description: Rest element containing an elision (for-await-of statement) esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation features: [generators, destructuring-binding, async-iteration] flags: [generated, async] info: | IterationStatement : for await ( var ForBinding of AssignmentExpression ) Statement [...] 2. Return ? ForIn/OfBodyEvaluation(ForBinding, Statement, keyResult, varBinding, labelSet, async). 13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation [...] 4. Let destructuring be IsDestructuring of lhs. [...] 6. Repeat [...] j. If destructuring is false, then [...] k. Else i. If lhsKind is assignment, then [...] ii. Else if lhsKind is varBinding, then 1. Assert: lhs is a ForBinding. 2. Let status be the result of performing BindingInitialization for lhs passing nextValue and undefined as the arguments. [...] 13.3.3.6 Runtime Semantics: IteratorBindingInitialization BindingRestElement : ... BindingPattern 1. Let A be ArrayCreate(0). [...] 3. Repeat [...] b. If iteratorRecord.[[done]] is true, then i. Return the result of performing BindingInitialization of BindingPattern with A and environment as the arguments. [...] 13.3.3.6 Runtime Semantics: IteratorBindingInitialization ArrayBindingPattern : [ Elision ] 1. Return the result of performing IteratorDestructuringAssignmentEvaluation of Elision with iteratorRecord as the argument. 12.14.5.3 Runtime Semantics: IteratorDestructuringAssignmentEvaluation Elision : , 1. If iteratorRecord.[[done]] is false, then a. Let next be IteratorStep(iteratorRecord.[[iterator]]). b. If next is an abrupt completion, set iteratorRecord.[[done]] to true. c. ReturnIfAbrupt(next). d. If next is false, set iteratorRecord.[[done]] to true. 2. Return NormalCompletion(empty). ---*/ var first = 0; var second = 0; function* g() { first += 1; yield; second += 1; }; var iterCount = 0; async function *fn() { for await (var [...[,]] of [g()]) { assert.sameValue(first, 1); assert.sameValue(second, 1); iterCount += 1; } } fn().next() .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) .then($DONE, $DONE);