1--TEST--
2Test nullsafe in function argument
3--FILE--
4<?php
5
6class Foo {
7    public $bar;
8}
9
10function set(&$ref, $value) {
11    $ref = $value;
12}
13
14function test($foo) {
15    try {
16        set($foo?->bar, 'bar');
17    } catch (Error $e) {
18        echo $e->getMessage() . "\n";
19    }
20    try {
21        (strrev('tes'))($foo?->bar, 'bar2');
22    } catch (Error $e) {
23        echo $e->getMessage() . "\n";
24    }
25}
26
27test(null);
28test(new Foo());
29
30?>
31--EXPECT--
32set(): Argument #1 ($ref) could not be passed by reference
33set(): Argument #1 ($ref) could not be passed by reference
34set(): Argument #1 ($ref) could not be passed by reference
35set(): Argument #1 ($ref) could not be passed by reference
36