1--TEST-- 2A notice is thrown when yielding a constant value by reference 3--FILE-- 4<?php 5 6function &gen() { 7 yield "foo"; 8} 9 10$gen = gen(); 11var_dump($gen->current()); 12 13?> 14--EXPECTF-- 15Notice: Only variable references should be yielded by reference in %s on line %d 16string(3) "foo" 17