src/dstr-assignment/array-elem-iter-thrw-close.case

// Copyright (C) 2016 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
desc: >
    IteratorClose is called when reference evaluation produces a "throw"
    completion
info: |
    ArrayAssignmentPattern : [ AssignmentElementList ]

    [...]
    5. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
       result).
    6. Return result.

    7.4.6 IteratorClose( iterator, completion )

    [...]
    6. Let innerResult be Call(return, iterator, « »).
    [...]
features: [Symbol.iterator]
template: error
esid: sec-runtime-semantics-destructuringassignmentevaluation
---*/

//- setup
var nextCount = 0;
var returnCount = 0;
var thisValue = null;
var args = null;
var iterable = {};
var iterator = {
  next: function() {
    nextCount += 1;
    return { done: true };
  },
  return: function() {
    returnCount += 1;
    thisValue = this;
    args = arguments;
  }
};
var thrower = function() {
  throw new Test262Error();
};
iterable[Symbol.iterator] = function() {
  return iterator;
};
//- error
Test262Error
//- elems
[ {}[thrower()] ]
//- vals
iterable
//- teardown
assert.sameValue(nextCount, 0);
assert.sameValue(returnCount, 1);
assert.sameValue(thisValue, iterator, 'correct `this` value');
assert(!!args, 'arguments object provided');
assert.sameValue(args.length, 0, 'zero arguments specified');