JSTests/test262/test/language/expressions/assignment/dstr/array-elem-trlg-iter-elision-iter-nrml-close.js

// This file was procedurally generated from the following sources:
// - src/dstr-assignment/array-elem-trlg-iter-elision-iter-nrml-close.case
// - src/dstr-assignment/default/assignment-expr.template
/*---
description: IteratorClose invoked when elision does not exhaust the iterator (AssignmentExpression)
esid: sec-variable-statement-runtime-semantics-evaluation
features: [Symbol.iterator, destructuring-binding]
flags: [generated]
info: |
    VariableDeclaration : BindingPattern Initializer

    1. Let rhs be the result of evaluating Initializer.
    2. Let rval be GetValue(rhs).
    3. ReturnIfAbrupt(rval).
    4. Return the result of performing BindingInitialization for
       BindingPattern passing rval and undefined as arguments.

    ArrayAssignmentPattern :
        [ AssignmentElementList , Elisionopt AssignmentRestElementopt ]

    [...]
    6. If Elision is present, then
       a. Let status be the result of performing
          IteratorDestructuringAssignmentEvaluation of Elision with
          iteratorRecord as the argument.
       b. If status is an abrupt completion, then
          [...]
    8. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
       status).

    7.4.6 IteratorClose( iterator, completion )

    [...]
    6. Let innerResult be Call(return, iterator, « »).
    [...]

---*/
var nextCount = 0;
var returnCount = 0;
var thisValue = null;
var args = null;
var iterable = {};
var x;
var iterator = {
  next: function() {
    nextCount += 1;

    // Set an upper-bound to limit unnecessary iteration in non-conformant
    // implementations
    return { done: nextCount > 10 };
  },
  return: function() {
    returnCount += 1;
    thisValue = this;
    args = arguments;
    return {};
  }
};
iterable[Symbol.iterator] = function() {
  return iterator;
};

var result;
var vals = iterable;

result = [ x , , ] = vals;

assert.sameValue(nextCount, 2);
assert.sameValue(returnCount, 1);
assert.sameValue(thisValue, iterator, 'correct `this` value');
assert(!!args, 'arguments object provided');
assert.sameValue(args.length, 0, 'zero arguments specified');

assert.sameValue(result, vals);