src/dstr-binding/ary-init-iter-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: Iterator is closed when not exhausted by pattern evaluation
template: default
info: |
    13.3.3.5 Runtime Semantics: BindingInitialization

    BindingPattern : ArrayBindingPattern

    [...]
    4. If iteratorRecord.[[done]] is false, return ? IteratorClose(iterator,
       result).
    [...]
features: [Symbol.iterator]
---*/

//- setup
var doneCallCount = 0;
var iter = {};
iter[Symbol.iterator] = function() {
  return {
    next: function() {
      return { value: null, done: false };
    },
    return: function() {
      doneCallCount += 1;
      return {};
    }
  };
};
//- elems
[x]
//- vals
iter
//- body
assert.sameValue(doneCallCount, 1);