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--TEST--
SplDoublyLinkedList Iterating a DLL by reference shouldn't be permitted
--CREDITS--
Mark Baker mark@lange.demon.co.uk at the PHPNW2017 Conference for PHP Testfest 2017
--FILE--
<?php
$dll = new SplDoublyLinkedList();
$dll->push(2);
$dll->push(3);
try {
foreach($dll as $key => &$value) {
// We should never see this output, because the "by reference" exception should be thrown in the previous line
echo $value, PHP_EOL;
$value *= $value;
echo $value, PHP_EOL;
}
} catch (\Error $e) {
echo $e->getMessage(), PHP_EOL;
}
?>
--EXPECT--
An iterator cannot be used with foreach by reference
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