test/language/statements/for-await-of/dstr-var-obj-ptrn-id-init-skipped.js

// This file was procedurally generated from the following sources:
// - src/dstr-binding/obj-ptrn-id-init-skipped.case
// - src/dstr-binding/default/for-await-of-var.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 ( var ForBinding of AssignmentExpression ) Statement

    [...]
    2. Return ? ForIn/OfBodyEvaluation(ForBinding, Statement, keyResult,
        varBinding, labelSet, async).

    13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation

    [...]
    3. Let destructuring be IsDestructuring of lhs.
    [...]
    5. Repeat
       [...]
       h. If destructuring is false, then
          [...]
       i. 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.
          [...]

    13.3.3.7 Runtime Semantics: KeyedBindingInitialization

    SingleNameBinding : BindingIdentifier Initializeropt

    [...]
    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 (var { 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);