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--TEST--
Array offsets can be yielded by reference
--FILE--
<?php
function &gen(array &$array) {
yield $array[0];
}
$array = [1, 2, 3];
$gen = gen($array);
foreach ($gen as &$val) {
$val *= -1;
}
var_dump($array);
?>
--EXPECT--
array(3) {
[0]=>
&int(-1)
[1]=>
int(2)
[2]=>
int(3)
}