1--TEST-- 2Don't optimize object -> iterable 3--EXTENSIONS-- 4opcache 5--FILE-- 6<?php 7 8function test(object $arg): iterable { 9 return $arg; 10} 11test(new stdClass); 12 13?> 14--EXPECTF-- 15Fatal error: Uncaught TypeError: test(): Return value must be of type iterable, stdClass returned in %s:%d 16Stack trace: 17#0 %s(%d): test(Object(stdClass)) 18#1 {main} 19 thrown in %s on line %d 20