1--TEST--
2Observer: Retvals are observable that are: IS_CONST
3--SKIPIF--
4<?php if (!extension_loaded('zend-test')) die('skip: zend-test extension required'); ?>
5--INI--
6zend_test.observer.enabled=1
7zend_test.observer.observe_all=1
8zend_test.observer.show_return_value=1
9opcache.optimization_level=0
10--FILE--
11<?php
12function foo() {
13    return 'I should be observable'; // IS_CONST
14}
15
16$res = foo(); // Retval used
17foo(); // Retval unused
18
19echo 'Done' . PHP_EOL;
20?>
21--EXPECTF--
22<!-- init '%s%eobserver_retval_%d.php' -->
23<file '%s%eobserver_retval_%d.php'>
24  <!-- init foo() -->
25  <foo>
26  </foo:'I should be observable'>
27  <foo>
28  </foo:'I should be observable'>
29Done
30</file '%s%eobserver_retval_%d.php'>
31