// |reftest| async // This file was procedurally generated from the following sources: // - src/dstr-binding-for-await/ary-init-iter-close.case // - src/dstr-binding-for-await/default/for-await-of-async-gen-let.template /*--- description: Iterator is closed when not exhausted by pattern evaluation (for-await-of statement) 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 ( 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. [...] 13.3.3.5 Runtime Semantics: BindingInitialization BindingPattern : ArrayBindingPattern [...] 4. If iteratorRecord.[[done]] is false, return ? IteratorClose(iterator, result). [...] ---*/ var doneCallCount = 0; var iter = {}; iter[Symbol.iterator] = function() { return { next() { return { value: null, done: false }; }, return() { doneCallCount += 1; return {}; } }; }; var iterCount = 0; async function *fn() { for await (let [x] of [iter]) { assert.sameValue(doneCallCount, 1); iterCount += 1; } } fn().next() .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) .then($DONE, $DONE);