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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
// Destructuring rest arrays call the array iterator. This behaviour is
// observable when Array.prototype[Symbol.iterator] is overridden.
const oldArrayIterator = Array.prototype[Symbol.iterator];
try {
let callCount = 0;
Array.prototype[Symbol.iterator] = function() {
callCount += 1;
return oldArrayIterator.call(this);
};
// Array iterator called exactly once.
function arrayIterCalledOnce(...[]) { }
assertEq(callCount, 0);
arrayIterCalledOnce();
assertEq(callCount, 1);
// Array iterator not called before rest parameter.
callCount = 0;
function arrayIterNotCalledBeforeRest(t = assertEq(callCount, 0), ...[]) { }
assertEq(callCount, 0);
arrayIterNotCalledBeforeRest();
assertEq(callCount, 1);
// Array iterator called when rest parameter is processed.
callCount = 0;
function arrayIterCalledWhenDestructuring(...[t = assertEq(callCount, 1)]) { }
assertEq(callCount, 0);
arrayIterCalledWhenDestructuring();
assertEq(callCount, 1);
} finally {
Array.prototype[Symbol.iterator] = oldArrayIterator;
}
if (typeof reportCompare === "function")
reportCompare(0, 0);
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