// |reftest| async // This file was procedurally generated from the following sources: // - src/dstr-binding-for-await/ary-ptrn-elem-ary-empty-init.case // - src/dstr-binding-for-await/default/for-await-of-async-func-let-async.template /*--- description: BindingElement with array binding pattern and initializer is used (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 BindingElement : BindingPattern Initializer_opt [...] 2. If iteratorRecord.[[done]] is true, let v be undefined. 3. If Initializer is present and v is undefined, then a. Let defaultValue be the result of evaluating Initializer. b. Let v be ? GetValue(defaultValue). 4. Return the result of performing BindingInitialization of BindingPattern with v and environment as the arguments. ---*/ var initCount = 0; var iterCount = 0; var iter = function*() { iterCount += 1; }(); var iterCount = 0; var asyncIter = (async function*() { yield* [[]]; })(); async function fn() { for await (let [[] = function() { initCount += 1; return iter; }()] of asyncIter) { assert.sameValue(initCount, 1); assert.sameValue(iterCount, 0); iterCount += 1; } } fn() .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) .then($DONE, $DONE);