/**
 * @template T
 * @param iterable<mixed, T> $iterable
 * @return ($iterable is list ? never : list<T>)
 */
function iteratorToList(iterable $iterable): array {
	$list = [];
	foreach ($iterable as $item) {
		$list[] = $item;
	}
	return $list;
}

/**
 * @return iterable<string, string>
 */
function getItems(): iterable {
	yield 'a' => 'foo';
	yield 'b' => 'bar';
}

$items =  getItems();
$items = iteratorToList($items);

assert(count($items) === 2);