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<?php final readonly class A { public string $foo; public function __construct(string $foo) { $this->foo = $foo; } public function withFoo(string $foo): static { $other = clone $this; $other->foo = $foo; return $other; } } $a = new A('y')->withFoo('x')->withFoo('z'); var_dump($a);
Output for git.master_jit, git.master
Fatal error: Uncaught Error: Cannot modify readonly property A::$foo in /in/hnABl:12 Stack trace: #0 /in/hnABl(17): A->withFoo('x') #1 {main} thrown in /in/hnABl on line 12
Process exited with code 255.

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