1--TEST--
2Generators can yield by-reference
3--FILE--
4<?php
5
6function &iter(array &$array) {
7    foreach ($array as $key => &$value) {
8        yield $key => $value;
9    }
10}
11
12$array = [1, 2, 3];
13$iter = iter($array);
14foreach ($iter as &$value) {
15    $value *= -1;
16}
17var_dump($array);
18
19$array = [1, 2, 3];
20foreach (iter($array) as &$value) {
21    $value *= -1;
22}
23var_dump($array);
24
25?>
26--EXPECT--
27array(3) {
28  [0]=>
29  int(-1)
30  [1]=>
31  int(-2)
32  [2]=>
33  &int(-3)
34}
35array(3) {
36  [0]=>
37  int(-1)
38  [1]=>
39  int(-2)
40  [2]=>
41  &int(-3)
42}
43