return $a + $b;
}, 0));
?>
---EXPECT--
+--EXPECTF--
+Warning: {closure}(): Argument #1 ($a) must be passed by reference, value given in %s on line %d
+
+Warning: {closure}(): Argument #2 ($b) must be passed by reference, value given in %s on line %d
+
+Warning: {closure}(): Argument #1 ($a) must be passed by reference, value given in %s on line %d
+
+Warning: {closure}(): Argument #2 ($b) must be passed by reference, value given in %s on line %d
+
+Warning: {closure}(): Argument #1 ($a) must be passed by reference, value given in %s on line %d
+
+Warning: {closure}(): Argument #2 ($b) must be passed by reference, value given in %s on line %d
int(6)