// |reftest| async // This file was procedurally generated from the following sources: // - src/dstr-binding-for-await/obj-ptrn-id-init-skipped.case // - src/dstr-binding-for-await/default/for-await-of-async-func-let.template /*--- description: Destructuring initializer is not evaluated when value is not `undefined` (for-await-of statement) esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation features: [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. [...] 13.3.3.7 Runtime Semantics: KeyedBindingInitialization SingleNameBinding : BindingIdentifier Initializer_opt [...] 6. If Initializer is present and v is undefined, then [...] [...] ---*/ var initCount = 0; function counter() { initCount += 1; } var iterCount = 0; async function fn() { for await (let { w = counter(), x = counter(), y = counter(), z = counter() } of [{ w: null, x: 0, y: false, z: '' }]) { assert.sameValue(w, null); assert.sameValue(x, 0); assert.sameValue(y, false); assert.sameValue(z, ''); assert.sameValue(initCount, 0); iterCount += 1; } } fn() .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE) .then($DONE, $DONE);