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<?php class Foo{ public $var; public function set(?int $value){ $this->var = $value; } } $foo = new Foo(); $foo->set(null); var_dump($foo); $foo->set(1); var_dump($foo); $foo->set(); var_dump($foo);
Output for git.master, git.master_jit, rfc.property-hooks
object(Foo)#1 (1) { ["var"]=> NULL } object(Foo)#1 (1) { ["var"]=> int(1) } Fatal error: Uncaught ArgumentCountError: Too few arguments to function Foo::set(), 0 passed in /in/n3FrG on line 16 and exactly 1 expected in /in/n3FrG:6 Stack trace: #0 /in/n3FrG(16): Foo->set() #1 {main} thrown in /in/n3FrG on line 6
Process exited with code 255.

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