--TEST--
ArrayObject illegal offset
--FILE--
<?php

$ao = new ArrayObject([1, 2, 3]);
try {
    var_dump($ao[[]]);
} catch (TypeError $e) {
    echo $e->getMessage(), "\n";
}
try {
    $ao[[]] = new stdClass;
} catch (TypeError $e) {
    echo $e->getMessage(), "\n";
}
try {
    $ref =& $ao[[]];
} catch (TypeError $e) {
    echo $e->getMessage(), "\n";
}
try {
    var_dump(isset($ao[[]]));
} catch (TypeError $e) {
    echo $e->getMessage(), "\n";
}
try {
    unset($ao[[]]);
} catch (TypeError $e) {
    echo $e->getMessage(), "\n";
}

?>
--EXPECT--
Cannot access offset of type array on ArrayObject
Cannot access offset of type array on ArrayObject
Cannot access offset of type array on ArrayObject
Cannot access offset of type array in isset or empty
Cannot unset offset of type array on ArrayObject