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<?php final class Thing { public function __construct(public readonly string $something) {} public function withSomething(string $something): self { $instance = clone $this; $instance->something = $something; return $instance; } } $thing = new Thing('hello'); $thing = $thing->withSomething('goodbye');
Output for git.master_jit, git.master
Fatal error: Uncaught Error: Cannot modify readonly property Thing::$something in /in/og8bn:10 Stack trace: #0 /in/og8bn(18): Thing->withSomething('goodbye') #1 {main} thrown in /in/og8bn on line 10
Process exited with code 255.

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