1--TEST--
2Non-ref generators cannot be iterated by-ref
3--FILE--
4<?php
5
6function gen() { yield; }
7
8$gen = gen();
9foreach ($gen as &$value) { }
10
11?>
12--EXPECTF--
13Fatal error: Uncaught Exception: You can only iterate a generator by-reference if it declared that it yields by-reference in %s:%d
14Stack trace:
15#0 {main}
16  thrown in %s on line %d
17