Description:
------------
The '@' error suppression operator appears to not work correctly when wrapped by IteratorIterator. The issue occurs when an error is triggered (and supposedly suppressed) in getIterator() in the inner iterator - an InvalidArgumentException is thrown instead.

I’ve not tested this in any great detail, or with other iterator types (apologies, time is tight at the moment).

Test script:
---------------
<?php

class CustomIterator implements IteratorAggregate {
	public function getIterator() {
		@unlink('/missing/file.txt');
		return new ArrayIterator(array('item'));
	}
}

$obj = new CustomIterator;
$iterator = new IteratorIterator($obj);

echo 'done';

Expected result:
----------------
Text 'done' should be shown

Actual result:
--------------
Fatal error: Uncaught exception 'InvalidArgumentException' with message 'unlink(/missing/file.txt): No such file or directory'