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