1--TEST--
2Argument name for Closure::__invoke via call_user_func reference warning
3--FILE--
4<?php
5
6$test = function(&$arg) {};
7call_user_func([$test, '__invoke'], null);
8
9?>
10--EXPECTF--
11Warning: Closure::__invoke(): Argument #1 ($arg) must be passed by reference, value given in %s on line %d
12