1--TEST--
2Null coalesce assign with memoized constant operand that is later interned (OSS-Fuzz #17903)
3--FILE--
4<?php
5$foo[__DIR__] ??= 42;
6var_dump($foo);
7?>
8--EXPECTF--
9array(1) {
10  ["%s"]=>
11  int(42)
12}
13