test262/test/language/expressions/assignment/dstr-array-elem-trlg-iter-rest-thrw-close-skip.js

// This file was procedurally generated from the following sources:
// - src/dstr-assignment/array-elem-trlg-iter-rest-thrw-close-skip.case
// - src/dstr-assignment/error/assignment-expr.template
/*---
description: Abrupt completion returned during iteration for rest element (AssignmentExpression)
esid: sec-variable-statement-runtime-semantics-evaluation
es6id: 13.3.2.4
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 ]

    [...]
    7. If AssignmentRestElement is present, then
       a. Let status be the result of performing
          IteratorDestructuringAssignmentEvaluation of AssignmentRestElement
          with iteratorRecord as the argument.
    8. If iteratorRecord.[[done]] is false, return IteratorClose(iterator,
       status).
    9. Return Completion(status).

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

    if (nextCount === 2) {
      throw new Test262Error();
    }

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

assert.throws(Test262Error, function() {
  0, [ x , ...x ] = iterable;
});

assert.sameValue(nextCount, 2);
assert.sameValue(returnCount, 0);