1--TEST--
2Unpacking of string keys is supported at compile-time
3--FILE--
4<?php
5
6var_dump([...['a' => 'b']]);
7var_dump(['a' => 'X', ...['a' => 'b']]);
8var_dump([...['a' => 'b'], 'a' => 'X']);
9
10?>
11--EXPECT--
12array(1) {
13  ["a"]=>
14  string(1) "b"
15}
16array(1) {
17  ["a"]=>
18  string(1) "b"
19}
20array(1) {
21  ["a"]=>
22  string(1) "X"
23}
24