src/dstr-assignment-for-await/array-rest-lref.case

// Copyright (C) 2017 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
desc: Reference is evaluated during assignment
info: |
    ArrayAssignmentPattern : [ Elisionopt AssignmentRestElement ]

    [...]
    4. Let result be the result of performing
      IteratorDestructuringAssignmentEvaluation of AssignmentRestElement
      with iteratorRecord as the argument.
    5. If iteratorRecord.[[Done]] is false, return ? IteratorClose(iterator, result).


    AssignmentRestElement[Yield] : ... DestructuringAssignmentTarget

    1. If DestructuringAssignmentTarget is neither an ObjectLiteral nor an
       ArrayLiteral, then
       a. Let lref be the result of evaluating DestructuringAssignmentTarget.
       b. ReturnIfAbrupt(lref).
    [...]
features: [Symbol.iterator]
template: async-generator
esid: sec-runtime-semantics-destructuringassignmentevaluation
---*/

//- setup
let nextCount = 0;
let returnCount = 0;
let iterator = {
  next() {
    nextCount += 1;
    return { done: true };
  },
  return() {
    returnCount += 1;
  }
};
let obj = {};
let iterable = {
  [Symbol.iterator]() {
    return iterator;
  }
};
//- elems
[...obj['a' + 'b']]
//- vals
iterable
//- body
assert.sameValue(nextCount, 1);
assert.sameValue(returnCount, 0);
assert(!!obj.ab);
assert.sameValue(obj.ab.length, 0);

//- teardown
iter.next()
  .then(() => assert.sameValue(iterCount, 1, 'iteration occurred as expected'), $DONE)
  .then($DONE, $DONE);