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<?php class A { private readonly array $matches; public function __construct() { \preg_match('/t/', '', $this->matches); } } new A();
Output for git.master, git.master_jit
Fatal error: Uncaught Error: Cannot indirectly modify readonly property A::$matches in /in/DdVMXM:9 Stack trace: #0 /in/DdVMXM(13): A->__construct() #1 {main} thrown in /in/DdVMXM on line 9
Process exited with code 255.

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