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