// |reftest| async // This file was procedurally generated from the following sources: // - src/dstr-binding-for-await/ary-ptrn-elision-step-err.case // - src/dstr-binding-for-await/error/for-await-of-async-func-let.template /*--- description: Elision advances iterator and forwards abrupt completions (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 ( ForDeclaration of AssignmentExpression ) Statement [...] 2. Return ? ForIn/OfBodyEvaluation(ForDeclaration, Statement, keyResult, lexicalBinding, 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 [...] iii. Else, 1. Assert: lhsKind is lexicalBinding. 2. Assert: lhs is a ForDeclaration. 3. Let status be the result of performing BindingInitialization for lhs passing nextValue and iterationEnv as 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). ---*/ var following = 0; var iter = function* () { throw new Test262Error(); following += 1; }(); async function fn() { for await (let [,] of [iter]) { return; } } fn() .then(_ => { throw new Test262Error("Expected async function to reject, but resolved."); }, ({ constructor }) => { assert.sameValue(constructor, Test262Error); assert.sameValue(following, 0, "iterator is properly closed"); }) .then($DONE, $DONE);